libgap-sage-doc 4.8.5+3+20160327g69a66f0+dsx-3 (amd64 binary) in ubuntu zesty

 GAP is a system for computational group theory. LibGAP contains a shared
 library version of the GAP kernel, allowing you to directly talk to GAP
 from your own C/C++ code.
 .
 Much of the group theory in SageMath is implemented using LibGAP.
 .
 This package provides documentation and examples.