- HAP - a GAP package for
Homological Algebra Programming is available here.

- GAPcode for computing

(i) the integral homology groups and

(ii) the low-dimensions of a free ZG-resolution for a finite group G

starting with a generating set for G. Available as a text file. The code is described in the paper on "Computing Group Resolutions". The computations in that paper were obtained by applying the code to the following generating sets.

Robert Morse has improved the efficiency of the original GAP code. His improved version is available here.

- GAP code written by Irina Kholodna for calculating free resolutions of a (smallish) finite group starting with a group presentation. Available as text files for GAPv3 and GAPv4.

- MAGMA code for calculating nonabelian tensor products of finite groups and related constructions. Available as a text file.

- MAGMA code for calculating the second cohomology of a finite group with coefficients in a finite abelian group. Available as a text file.