Firefox. Runs on all the platforms I use (Linux, Android and Windows). Shares state between all the devices I run it in. Been somewhat the same since Phoenix days for me, the end user.<p>GNU Core Utils. They've been the pretty much the same since I first learned about those.
- VLC: If it can't play it, it's not a video or audio file.<p>- nginx: It's fast and has a lot of features.<p>- MAME: Arcade emulator, this project is amazing.<p>- ImageMagick convert: Wonderful command line tool for manipulating images<p>- ffmpeg: Wonderful command line tool for manipulating videos