Rewrite the supported tools lists in new files

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+# ALE Supported Languages and Tools
+
+This plugin supports the following languages and tools. All available
+tools will be run in combination, so they can be complementary.
+
+<!--
+Keep the table rows sorted alphabetically by the language name,
+and the tools in the tools column sorted alphabetically by the tool
+name. That seems to be the fairest way to arrange this table.
+
+Remember to also update doc/ale.txt, which has a similar list with different
+formatting.
+-->
+
+**Legend**
+
+|      Key      |             Definition           |
+| ------------- | -------------------------------- |
+| :floppy_disk: | Only checked when saved to disk  |
+|   :warning:   | Disabled by default              |
+
+---
+
+* Ada
+  * [gcc](https://gcc.gnu.org)
+* Ansible
+  * [ansible-lint](https://github.com/willthames/ansible-lint)
+* API Blueprint
+  * [drafter](https://github.com/apiaryio/drafter)
+* AsciiDoc
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [redpen](http://redpen.cc/)
+  * [textlint](https://textlint.github.io/)
+  * [vale](https://github.com/ValeLint/vale)
+  * [write-good](https://github.com/btford/write-good)
+* ASM
+  * [gcc](https://gcc.gnu.org)
+* Awk
+  * [gawk](https://www.gnu.org/software/gawk/)
+* Bash
+  * [language-server](https://github.com/mads-hartmann/bash-language-server)
+  * shell [-n flag](https://www.gnu.org/software/bash/manual/bash.html#index-set)
+  * [shellcheck](https://www.shellcheck.net/)
+  * [shfmt](https://github.com/mvdan/sh)
+* BibTeX
+  * [bibclean](http://ftp.math.utah.edu/pub/bibclean/)
+* Bourne Shell
+  * shell [-n flag](http://linux.die.net/man/1/sh)
+  * [shellcheck](https://www.shellcheck.net/)
+  * [shfmt](https://github.com/mvdan/sh)
+* C
+  * [ccls](https://github.com/MaskRay/ccls)
+  * [clang](http://clang.llvm.org/)
+  * [clangd](https://clang.llvm.org/extra/clangd.html)
+  * [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
+  * [clangtidy](http://clang.llvm.org/extra/clang-tidy/) :floppy_disk:
+  * [cppcheck](http://cppcheck.sourceforge.net)
+  * [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint)
+  * [cquery](https://github.com/cquery-project/cquery)
+  * [flawfinder](https://www.dwheeler.com/flawfinder/)
+  * [gcc](https://gcc.gnu.org/)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* C#
+  * [mcs](http://www.mono-project.com/docs/about-mono/languages/csharp/) see:`help ale-cs-mcs` for details
+  * [mcsc](http://www.mono-project.com/docs/about-mono/languages/csharp/) :floppy_disk: see:`help ale-cs-mcsc` for details and configuration
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* C++ (filetype cpp)
+  * [ccls](https://github.com/MaskRay/ccls)
+  * [clang](http://clang.llvm.org/)
+  * [clangcheck](http://clang.llvm.org/docs/ClangCheck.html) :floppy_disk:
+  * [clangd](https://clang.llvm.org/extra/clangd.html)
+  * [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
+  * [clangtidy](http://clang.llvm.org/extra/clang-tidy/) :floppy_disk:
+  * [clazy](https://github.com/KDE/clazy) :floppy_disk:
+  * [cppcheck](http://cppcheck.sourceforge.net)
+  * [cpplint](https://github.com/google/styleguide/tree/gh-pages/cpplint) :floppy_disk:
+  * [cquery](https://github.com/cquery-project/cquery)
+  * [flawfinder](https://www.dwheeler.com/flawfinder/)
+  * [gcc](https://gcc.gnu.org/)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* Chef
+  * [foodcritic](http://www.foodcritic.io/)
+* Clojure
+  * [joker](https://github.com/candid82/joker)
+* CloudFormation
+  * [cfn-python-lint](https://github.com/awslabs/cfn-python-lint)
+* CMake
+  * [cmake-format](https://github.com/cheshirekow/cmake_format)
+  * [cmakelint](https://github.com/richq/cmake-lint)
+* CoffeeScript
+  * [coffee](http://coffeescript.org/)
+  * [coffeelint](https://www.npmjs.com/package/coffeelint)
+* Crystal
+  * [ameba](https://github.com/veelenga/ameba) :floppy_disk:
+  * [crystal](https://crystal-lang.org/) :floppy_disk:
+* CSS
+  * [csslint](http://csslint.net/)
+  * [prettier](https://github.com/prettier/prettier)
+  * [stylelint](https://github.com/stylelint/stylelint)
+* Cucumber
+  * [cucumber](https://cucumber.io/)
+* CUDA
+  * [nvcc](http://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html)
+* Cypher
+  * [cypher-lint](https://github.com/cleishm/libcypher-parser)
+* Cython (pyrex filetype)
+  * [cython](http://cython.org/)
+* D
+  * [dls](https://github.com/d-language-server/dls)
+  * [dmd](https://dlang.org/dmd-linux.html)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* Dafny
+  * [dafny](https://rise4fun.com/Dafny) :floppy_disk:
+* Dart
+  * [dartanalyzer](https://github.com/dart-lang/sdk/tree/master/pkg/analyzer_cli) :floppy_disk:
+  * [dartfmt](https://github.com/dart-lang/sdk/tree/master/utils/dartfmt)
+  * [language_server](https://github.com/natebosch/dart_language_server)
+* Dockerfile
+  * [dockerfile_lint](https://github.com/projectatomic/dockerfile_lint)
+  * [hadolint](https://github.com/hadolint/hadolint)
+* Elixir
+  * [credo](https://github.com/rrrene/credo)
+  * [dialyxir](https://github.com/jeremyjh/dialyxir)
+  * [dogma](https://github.com/lpil/dogma)
+  * [elixir-ls](https://github.com/JakeBecker/elixir-ls)
+  * [mix](https://hexdocs.pm/mix/Mix.html) :warning: :floppy_disk:
+* Elm
+  * [elm-format](https://github.com/avh4/elm-format)
+  * [elm-make](https://github.com/elm-lang/elm-make)
+* Erb
+  * [erb](https://apidock.com/ruby/ERB)
+  * [erubi](https://github.com/jeremyevans/erubi)
+  * [erubis](https://github.com/kwatch/erubis)
+  * [ruumba](https://github.com/ericqweinstein/ruumba)
+* Erlang
+  * [erlc](http://erlang.org/doc/man/erlc.html)
+  * [SyntaxErl](https://github.com/ten0s/syntaxerl)
+* Fish
+  * fish [-n flag](https://linux.die.net/man/1/fish)
+* Fortran
+  * [gcc](https://gcc.gnu.org/)
+  * [language_server](https://github.com/hansec/fortran-language-server)
+* Fountain
+  * [proselint](http://proselint.com/)
+* FusionScript
+  * [fusion-lint](https://github.com/RyanSquared/fusionscript)
+* Git Commit Messages
+  * [gitlint](https://github.com/jorisroovers/gitlint)
+* GLSL
+  * [glslang](https://github.com/KhronosGroup/glslang)
+  * [glslls](https://github.com/svenstaro/glsl-language-server)
+* Go
+  * [bingo](https://github.com/saibing/bingo) :warning:
+  * [go build](https://golang.org/cmd/go/) :warning: :floppy_disk:
+  * [gofmt](https://golang.org/cmd/gofmt/)
+  * [goimports](https://godoc.org/golang.org/x/tools/cmd/goimports) :warning:
+  * [golangci-lint](https://github.com/golangci/golangci-lint) :warning: :floppy_disk:
+  * [golangserver](https://github.com/sourcegraph/go-langserver) :warning:
+  * [golint](https://godoc.org/github.com/golang/lint)
+  * [gometalinter](https://github.com/alecthomas/gometalinter) :warning: :floppy_disk:
+  * [go mod](https://golang.org/cmd/go/) :warning: :floppy_disk:
+  * [gosimple](https://github.com/dominikh/go-tools/tree/master/cmd/gosimple) :warning: :floppy_disk:
+  * [gotype](https://godoc.org/golang.org/x/tools/cmd/gotype) :warning: :floppy_disk:
+  * [go vet](https://golang.org/cmd/vet/) :floppy_disk:
+  * [staticcheck](https://github.com/dominikh/go-tools/tree/master/cmd/staticcheck) :warning: :floppy_disk:
+* GraphQL
+  * [eslint](http://eslint.org/)
+  * [gqlint](https://github.com/happylinks/gqlint)
+  * [prettier](https://github.com/prettier/prettier)
+* Hack
+  * [hack](http://hacklang.org/)
+  * [hackfmt](https://github.com/facebook/hhvm/tree/master/hphp/hack/hackfmt) :warning:
+  * [hhast](https://github.com/hhvm/hhast) :warning: (see `:help ale-integration-hack`)
+* Haml
+  * [haml-lint](https://github.com/brigade/haml-lint)
+* Handlebars
+  * [ember-template-lint](https://github.com/rwjblue/ember-template-lint)
+* Haskell
+  * [brittany](https://github.com/lspitzner/brittany)
+  * [cabal-ghc](https://www.haskell.org/cabal/)
+  * [ghc](https://www.haskell.org/ghc/)
+  * [ghc-mod](https://github.com/DanielG/ghc-mod)
+  * [hdevtools](https://hackage.haskell.org/package/hdevtools)
+  * [hfmt](https://github.com/danstiner/hfmt)
+  * [hie](https://github.com/haskell/haskell-ide-engine)
+  * [hlint](https://hackage.haskell.org/package/hlint)
+  * [stack-build](https://haskellstack.org/) :floppy_disk:
+  * [stack-ghc](https://haskellstack.org/)
+  * [stylish-haskell](https://github.com/jaspervdj/stylish-haskell)
+* HCL
+  * [terraform-fmt](https://github.com/hashicorp/terraform)
+* HTML
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [HTMLHint](http://htmlhint.com/)
+  * [prettier](https://github.com/prettier/prettier)
+  * [proselint](http://proselint.com/)
+  * [tidy](http://www.html-tidy.org/)
+  * [write-good](https://github.com/btford/write-good)
+* Idris
+  * [idris](http://www.idris-lang.org/)
+* ISPC
+  * [ispc](https://ispc.github.io/) :floppy_disk:
+* Java
+  * [checkstyle](http://checkstyle.sourceforge.net)
+  * [google-java-format](https://github.com/google/google-java-format)
+  * [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
+  * [javalsp](https://github.com/georgewfraser/vscode-javac)
+  * [PMD](https://pmd.github.io/)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* JavaScript
+  * [eslint](http://eslint.org/)
+  * [flow](https://flowtype.org/)
+  * [jscs](http://jscs.info/)
+  * [jshint](http://jshint.com/)
+  * [prettier](https://github.com/prettier/prettier)
+  * [prettier-eslint](https://github.com/prettier/prettier-eslint-cli)
+  * [prettier-standard](https://github.com/sheerun/prettier-standard)
+  * [standard](http://standardjs.com/)
+  * [tsserver](https://github.com/Microsoft/TypeScript/wiki/Standalone-Server-%28tsserver%29)
+  * [xo](https://github.com/sindresorhus/xo)
+* JSON
+  * [fixjson](https://github.com/rhysd/fixjson)
+  * [jq](https://stedolan.github.io/jq/)
+  * [jsonlint](http://zaa.ch/jsonlint/)
+  * [prettier](https://github.com/prettier/prettier)
+* Julia
+  * [languageserver](https://github.com/JuliaEditorSupport/LanguageServer.jl)
+* Kotlin
+  * [kotlinc](https://kotlinlang.org) :floppy_disk:
+  * [ktlint](https://ktlint.github.io) :floppy_disk:
+  * [languageserver](https://github.com/fwcd/KotlinLanguageServer) see `:help ale-integration-kotlin` for configuration instructions
+* LaTeX
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [chktex](http://www.nongnu.org/chktex/)
+  * [lacheck](https://www.ctan.org/pkg/lacheck)
+  * [proselint](http://proselint.com/)
+  * [redpen](http://redpen.cc/)
+  * [textlint](https://textlint.github.io/)
+  * [vale](https://github.com/ValeLint/vale)
+  * [write-good](https://github.com/btford/write-good)
+* Less
+  * [lessc](https://www.npmjs.com/package/less)
+  * [prettier](https://github.com/prettier/prettier)
+  * [stylelint](https://github.com/stylelint/stylelint)
+* LLVM
+  * [llc](https://llvm.org/docs/CommandGuide/llc.html)
+* Lua
+  * [luac](https://www.lua.org/manual/5.1/luac.html)
+  * [luacheck](https://github.com/mpeterv/luacheck)
+* Mail
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [vale](https://github.com/ValeLint/vale)
+* Make
+  * [checkmake](https://github.com/mrtazz/checkmake)
+* Markdown
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [markdownlint](https://github.com/DavidAnson/markdownlint) :floppy_disk:
+  * [mdl](https://github.com/mivok/markdownlint)
+  * [prettier](https://github.com/prettier/prettier)
+  * [proselint](http://proselint.com/)
+  * [redpen](http://redpen.cc/)
+  * [remark-lint](https://github.com/wooorm/remark-lint)
+  * [textlint](https://textlint.github.io/)
+  * [vale](https://github.com/ValeLint/vale)
+  * [write-good](https://github.com/btford/write-good)
+* MATLAB
+  * [mlint](https://www.mathworks.com/help/matlab/ref/mlint.html)
+* Mercury
+  * [mmc](http://mercurylang.org) :floppy_disk:
+* NASM
+  * [nasm](https://www.nasm.us/) :floppy_disk:
+* Nim
+  * [nim check](https://nim-lang.org/docs/nimc.html) :floppy_disk:
+* nix
+  * [nix-instantiate](http://nixos.org/nix/manual/#sec-nix-instantiate)
+* nroff
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [write-good](https://github.com/btford/write-good)
+* Objective-C
+  * [ccls](https://github.com/MaskRay/ccls)
+  * [clang](http://clang.llvm.org/)
+  * [clangd](https://clang.llvm.org/extra/clangd.html)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* Objective-C++
+  * [clang](http://clang.llvm.org/)
+  * [clangd](https://clang.llvm.org/extra/clangd.html)
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* OCaml
+  * [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-ocaml-merlin` for configuration instructions
+  * [ocamlformat](https://github.com/ocaml-ppx/ocamlformat)
+  * [ols](https://github.com/freebroccolo/ocaml-language-server)
+* Pawn
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* Perl
+  * [perl -c](https://perl.org/) :warning:
+  * [perl-critic](https://metacpan.org/pod/Perl::Critic)
+  * [perltidy](https://metacpan.org/pod/distribution/Perl-Tidy/bin/perltidy) :warning:
+* Perl6
+  * [perl6 -c](https://perl6.org) :warning:
+* PHP
+  * [langserver](https://github.com/felixfbecker/php-language-server)
+  * [phan](https://github.com/phan/phan) see `:help ale-php-phan` to instructions
+  * [phpcbf](https://github.com/squizlabs/PHP_CodeSniffer)
+  * [phpcs](https://github.com/squizlabs/PHP_CodeSniffer)
+  * [php-cs-fixer](http://cs.sensiolabs.org/)
+  * [php -l](https://secure.php.net/)
+  * [phpmd](https://phpmd.org)
+  * [phpstan](https://github.com/phpstan/phpstan)
+  * [psalm](https://getpsalm.org) :floppy_disk:
+* PO
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [msgfmt](https://www.gnu.org/software/gettext/manual/html_node/msgfmt-Invocation.html)
+  * [proselint](http://proselint.com/)
+  * [write-good](https://github.com/btford/write-good)
+* Pod
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [write-good](https://github.com/btford/write-good)
+* Pony
+  * [ponyc](https://github.com/ponylang/ponyc)
+* Prolog
+  * [swipl](https://github.com/SWI-Prolog/swipl-devel)
+* proto
+  * [protoc-gen-lint](https://github.com/ckaznocha/protoc-gen-lint)
+* Pug
+  * [pug-lint](https://github.com/pugjs/pug-lint)
+* Puppet
+  * [languageserver](https://github.com/lingua-pupuli/puppet-editor-services)
+  * [puppet](https://puppet.com)
+  * [puppet-lint](https://puppet-lint.com)
+* Python
+  * [autopep8](https://github.com/hhatto/autopep8) :warning:
+  * [bandit](https://github.com/PyCQA/bandit) :warning:
+  * [black](https://github.com/ambv/black) :warning:
+  * [flake8](http://flake8.pycqa.org/en/latest/)
+  * [isort](https://github.com/timothycrosley/isort) :warning:
+  * [mypy](http://mypy-lang.org/)
+  * [prospector](https://github.com/PyCQA/prospector) :warning:
+  * [pycodestyle](https://github.com/PyCQA/pycodestyle) :warning:
+  * [pydocstyle](https://www.pydocstyle.org/) :warning:
+  * [pylint](https://www.pylint.org/) :floppy_disk:
+  * [pyls](https://github.com/palantir/python-language-server) :warning:
+  * [pyre](https://github.com/facebook/pyre-check) :warning:
+  * [vulture](https://github.com/jendrikseipp/vulture) :warning: :floppy_disk:
+  * [yapf](https://github.com/google/yapf) :warning:
+* QML
+  * [qmlfmt](https://github.com/jesperhh/qmlfmt)
+  * [qmllint](https://github.com/qt/qtdeclarative/tree/5.11/tools/qmllint)
+* R
+  * [lintr](https://github.com/jimhester/lintr)
+* Racket
+  * [raco](https://docs.racket-lang.org/raco/)
+* ReasonML
+  * [merlin](https://github.com/the-lambda-church/merlin) see `:help ale-reasonml-ols` for configuration instructions
+  * [ols](https://github.com/freebroccolo/ocaml-language-server)
+  * [refmt](https://github.com/reasonml/reason-cli)
+* reStructuredText
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [redpen](http://redpen.cc/)
+  * [rstcheck](https://github.com/myint/rstcheck)
+  * [textlint](https://textlint.github.io/)
+  * [vale](https://github.com/ValeLint/vale)
+  * [write-good](https://github.com/btford/write-good)
+* Re:VIEW
+  * [redpen](http://redpen.cc/)
+* RPM spec
+  * [rpmlint](https://github.com/rpm-software-management/rpmlint) :warning: (see `:help ale-integration-spec`)
+* Ruby
+  * [brakeman](http://brakemanscanner.org/) :floppy_disk:
+  * [rails_best_practices](https://github.com/flyerhzm/rails_best_practices) :floppy_disk:
+  * [reek](https://github.com/troessner/reek)
+  * [rubocop](https://github.com/bbatsov/rubocop)
+  * [ruby](https://www.ruby-lang.org)
+  * [rufo](https://github.com/ruby-formatter/rufo)
+  * [solargraph](https://solargraph.org)
+  * [standardrb](https://github.com/testdouble/standard)
+* Rust
+  * [cargo](https://github.com/rust-lang/cargo) :floppy_disk: (see `:help ale-integration-rust` for configuration instructions)
+  * [rls](https://github.com/rust-lang-nursery/rls) :warning:
+  * [rustc](https://www.rust-lang.org/) :warning:
+  * [rustfmt](https://github.com/rust-lang-nursery/rustfmt)
+* Sass
+  * [sass-lint](https://www.npmjs.com/package/sass-lint)
+  * [stylelint](https://github.com/stylelint/stylelint)
+* Scala
+  * [fsc](https://www.scala-lang.org/old/sites/default/files/linuxsoft_archives/docu/files/tools/fsc.html)
+  * [sbtserver](https://www.scala-sbt.org/1.x/docs/sbt-server.html)
+  * [scalac](http://scala-lang.org)
+  * [scalafmt](https://scalameta.org/scalafmt/)
+  * [scalastyle](http://www.scalastyle.org)
+* SCSS
+  * [prettier](https://github.com/prettier/prettier)
+  * [sass-lint](https://www.npmjs.com/package/sass-lint)
+  * [scss-lint](https://github.com/brigade/scss-lint)
+  * [stylelint](https://github.com/stylelint/stylelint)
+* Slim
+  * [slim-lint](https://github.com/sds/slim-lint)
+* SML
+  * [smlnj](http://www.smlnj.org/)
+* Solidity
+  * [solhint](https://github.com/protofire/solhint)
+  * [solium](https://github.com/duaraghav8/Solium)
+* SQL
+  * [sqlfmt](https://github.com/jackc/sqlfmt)
+  * [sqlint](https://github.com/purcell/sqlint)
+* Stylus
+  * [stylelint](https://github.com/stylelint/stylelint)
+* SugarSS
+  * [stylelint](https://github.com/stylelint/stylelint)
+* Swift
+  * [swiftformat](https://github.com/nicklockwood/SwiftFormat)
+  * [swiftlint](https://github.com/realm/SwiftLint)
+* Tcl
+  * [nagelfar](http://nagelfar.sourceforge.net) :floppy_disk:
+* Terraform
+  * [fmt](https://github.com/hashicorp/terraform)
+  * [tflint](https://github.com/wata727/tflint)
+* Texinfo
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [write-good](https://github.com/btford/write-good)
+* Text
+  * [alex](https://github.com/wooorm/alex) :warning: :floppy_disk:
+  * [proselint](http://proselint.com/) :warning:
+  * [redpen](http://redpen.cc/) :warning:
+  * [textlint](https://textlint.github.io/) :warning:
+  * [vale](https://github.com/ValeLint/vale) :warning:
+  * [write-good](https://github.com/btford/write-good) :warning:
+* Thrift
+  * [thrift](http://thrift.apache.org/)
+* TypeScript
+  * [eslint](http://eslint.org/)
+  * [prettier](https://github.com/prettier/prettier)
+  * [tslint](https://github.com/palantir/tslint)
+  * [tsserver](https://github.com/Microsoft/TypeScript/wiki/Standalone-Server-%28tsserver%29)
+  * typecheck
+* VALA
+  * [uncrustify](https://github.com/uncrustify/uncrustify)
+* Verilog
+  * [iverilog](https://github.com/steveicarus/iverilog)
+  * [verilator](http://www.veripool.org/projects/verilator/wiki/Intro)
+  * [vlog](https://www.mentor.com/products/fv/questa/)
+  * [xvlog](https://www.xilinx.com/products/design-tools/vivado.html)
+* VHDL
+  * [ghdl](https://github.com/ghdl/ghdl)
+  * [vcom](https://www.mentor.com/products/fv/questa/)
+  * [xvhdl](https://www.xilinx.com/products/design-tools/vivado.html)
+* Vim
+  * [vint](https://github.com/Kuniwak/vint)
+* Vim help
+  * [alex](https://github.com/wooorm/alex) :warning: :floppy_disk:
+  * [proselint](http://proselint.com/) :warning:
+  * [write-good](https://github.com/btford/write-good) :warning:
+* Vue
+  * [prettier](https://github.com/prettier/prettier)
+  * [vls](https://github.com/vuejs/vetur/tree/master/server)
+* XHTML
+  * [alex](https://github.com/wooorm/alex) :floppy_disk:
+  * [proselint](http://proselint.com/)
+  * [write-good](https://github.com/btford/write-good)
+* XML
+  * [xmllint](http://xmlsoft.org/xmllint.html)
+* YAML
+  * [prettier](https://github.com/prettier/prettier)
+  * [swaglint](https://github.com/byCedric/swaglint)
+  * [yamllint](https://yamllint.readthedocs.io/)
+* YANG
+  * [yang-lsp](https://github.com/theia-ide/yang-lsp)