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#+TITLE: Spot
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Spot is a C++11 library for ω-automata manipulation and model
checking.  It has the following notable features:

- Support for [[file:concepts.org::#ltl][LTL]] (several syntaxes supported) and
  [[file:concepts.org::#psl][the linear fragment of PSL]].
- Support for ω-automata with [[file:concepts.org::#acceptance-condition][arbitrary acceptance condition]].
- Support for [[file:concepts.org::#trans-acc][transition-based acceptance]] (state-based acceptance is
  supported by a reduction to transition-based acceptance).
- The automaton parser can read a stream of automata written in any of
  four syntaxes ([[file:hoa.org][HOA]], [[http://spinroot.com/spin/Man/never.html][never claims]], [[http://www.tcs.hut.fi/Software/lbtt/doc/html/Format-for-automata.html][LBTT]], [[http://www.ltl2dstar.de/docs/ltl2dstar.html][DSTAR]]).
- Several algorithms for formula manipulation including: simplifying
  formulas, testing implication or equivalence, testing
  stutter-invariance, removing some operators by rewriting, translation
  to automata...
- Several algorithms for automata manipulation including: product,
  emptiness checks, simulation-based reductions, minimization of
  weak-DBA, removal of useless SCCs, acceptance-condition
  transformations, determinization, etc.
- In addition to the C++ interface, most of its algorithms are usable
  via [[file:tools.org][command-line tools]], and via Python bindings.
- One command-line tool, called [[file:ltlcross.org][=ltlcross=]], is a rewrite of
  [[http://www.tcs.hut.fi/Software/lbtt/][LBTT]], but with support for PSL and arbitrary acceptance conditions.
  It could for instance be used to test tools that translate LTL into
  Rabin automata.

* Latest version

The latest version is *{{{LASTRELEASE}}}* and was released on
*{{{LASTDATE}}}*.  Please see the [[file:install.org][download and installation instructions]].

* Documentation

- [[file:tools.org][Command-line tools]].
- [[file:tut.org][Code examples]].
- [[http://spot.lrde.epita.fr/doxygen/][Doxygen documentation]], generated automatically from the source code.
- [[https://spot.lrde.epita.fr/tl.pdf][Definition of the temporal operators supported by Spot]].

* On-line LTL/PSL translator

- [[http://spot.lrde.epita.fr/trans.html][Our on-line translator]] provides a convenient way to translate LTL or
  PSL formulas into automata, without installing Spot.

* License

Spot is distributed under a [[http://www.gnu.org/licenses/gpl-3.0.html][GNU GPL v3 license]].

A consequence is that if you distribute a tool built using Spot, you
*must* make the source code of that tool available as well.

* Staying in touch

=spot-announce@lrde.epita.fr= is an extremely low-traffic and
read-only mailing list for release announcements.  If you want to stay
informed about future releases of Spot, we invite you to [[https://lists.lrde.epita.fr/listinfo/spot-announce][subscribe]].

[[mailto:spot@lrde.epita.fr][=spot@lrde.epita.fr=]] is a list for general discussions and questions
about Spot. [[https://lists.lrde.epita.fr/listinfo/spot][Subscribe here]] if you want to join, but feel free to send
in any question (in English) or bug report without subscribing.