Current answer set solvers work on variable-free programs. Hence, a grounder is needed that, given an input program with first-order variables, computes an equivalent ground (variable-free) program. gringo is such a grounder. Its output can be processed further with clasp, claspfolio, or clingcon.
clingo combines both gringo and clasp into a monolithic system. This way it offers more control over the grounding and solving process than gringo and clasp can offer individually - e.g., incremental grounding and solving.
Both clingo and gringo are released together in one package.
Attention! The languages of clingo 3 and 4 are not fully compatible because clingo 4 adheres to the recent ASP language standard. For processing legacy encodings, we recommend downloading the latest version of clingo 3 in addition to clingo 4. The language did not change in version 5 but there were many API changes.
- Recent clingo releases are on github: github.com/potassco/clingo/releases.
- The latest source is on github: github.com/potassco/clingo.
- clingo up to version 4.x is available on sourceforge: sourceforge.net/projects/potassco/files/clingo.
- clingo versions 2.x are also available on sourceforge: sourceforge/projects/potassco/files/gringo.
- Packages for clingo and gringo are available in the linux distributions Debian, Ubuntu, and Arch Linux (AUR).
- For Mac OS X, both clingo and gringo are available in homebrew and macports as part of gringo.