GAP is a system for computational discrete algebra, with particular emphasis on Computational Group Theory. GAP provides a programming language, a library of thousands of functions implementing algebraic algorithms written in the GAP language as well as large data libraries of algebraic objects. GAP is used in research and teaching for studying groups and their representations, rings, vector spaces, algebras, combinatorial structures, and more.

The AGT package contains a methods used for the determination of
various algebraic and regularity properties of graphs, as well as
certain substructures of graphs. The package also contains a library
of strongly regular graphs, intended to be a resource for
computational experiments.