I am using git bash on Windows - that is git for Windows via the integrated bash. Apparently it uses the MINGW/MSYS underpinning. (Update from @VonC: It now uses msys2 since msysgit is obsolete since Q4 2015.)
So there are already a lot of MSYS tools installed - from awk to zcat. However I miss the man command and zip to compress multiple files into a zip file (unzip exists!).
Where from can I install them? I do not want to install another copy of the MINGW system! Any way just to add some pre-compiled tools to the git bash installation?