Gauss Manuals in pdf format

Gauss 8.0 User Guide - Large file
Language Reference 8.0 - Large file

Gauss 7.0 User Guide - Large file
Language Reference 7.0 - Large file

Gauss 6.0 User Guide - Large file
Language Reference 6.0 - Large file

GaussX 5
Constrained Optimization
FANPAC
Maximum Likelihood Estimation v5.0
Optimization