CTL-SAT is a CTL (Computation Tree Logic) SAT solver. The user may test
satisfiability of a CTL formula may by providing it as a command-line argument
to the ctl-sat program, e.g.:

  ctl-sat "~( (A(pUq) ^ AG(q->r) ^ AG(r->EXr)) -> EFEGr )"

The worst-case time complexity is O((2^n)^3) for this SAT solver, while the
worst-case space complexity is O((2^n)^2).