From everything I tried, bzr was incredibly slow here, even on vanilla Debian systems, including the "bzr rocks" (which it does not) command. I was told that "you're doing it wrong", but I don't know what or how. A friend commented that "Bzr was slower than Subversion in combination with SourceForge.net" and it seems that he was right.
An open, cross-platform journaling program.
A scientific plotting package.