Lisaac is a small prototype-based programming language. The ideas in Lisaac are mostly inspired by Smalltalk (all values are objects), Self (prototype-based) and Eiffel (design by contract). It has the following features:

* pure object language * very fast (like C code) * dynamic and multiple inheritance * dynamic definition slots * static typing (invariant) * generic types * auto-cast type system * programming by contract * interrupt manager * include C code facilities