vim, tmux, zsh, mutt (ppl & ldap for addressing), vimperator, qemu, pass, homebrew, seahorse, general programming languages, general unix utils, pandoc (& LaTeX), ffmpeg, kdenlive, lots of associated plugins and helper scripts, keyremap4macbook, tarsnap, rtorrent, nginx, plex. Probably much more in the future (homebrew's repo is huge); I'm just recently making the switch from Arch.

I'll need a better free & open cloud sync solution, but I was using Dropbox on Linux anyway.