Smodels works with variable-free programs that are quite cumbersome to generate by hand. Lparse is a front-end that adds variables (and a lot of other stuff) to the accepted language and generates a variable-free simple logic program that can be given to smodels. Lparse also implements several other semantics (classical negation, partial stable models) by translating them into normal logic programs.

WWW: http://www.tcs.hut.fi/Software/smodels
