GAP PrimGrp - GAP Primitive Permutation Groups Library

 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 Primitive Permutation Groups Library. includes, up to permutation
 isomorphism (i.e., up to conjugacy in the corresponding symmetric group), all
 primitive permutation groups of degree < 4096.