ruby-build provides a simple way to compile and install different versions of Ruby on UNIX-like systems.

GIT utilities -- repo summary, repl, changelog population, author commit percentages and more

Various tools I need.

tinc is a Virtual Private Network (VPN) daemon that uses tunnelling
and encryption to create a secure private network between hosts on
the Internet. Because the tunnel appears to the IP level network
code as a normal network device, there is no need to adapt any
existing software. This tunnelling allows VPN sites to share
information with each other over the Internet without exposing any
information to others.

All the little tools you need to get your work done.