When I first bought my Powerbook (with 6 GB hard drive), I had a great idea. Partition the hard-drive into three sections, one each for MacOS 9, LinuxPPC, and (for the future) OS X (with a few extra utility partitions for Linux swap space, etc.). But then OS X came along, and so did an MP3 collection. I removed Linux, since I could SSH, emacs, and perl perfectly fine in OS X, and the old Linux directory became an MP3 disk. But OS X is huge, and I felt a little cramped in the 1.7 GB partition, and backing up all the data I had would be too difficult, so repartitioning was out of the question. So I wrote Monolingual (More...
Version 1.1.2 adds Simplified and Traditional Chinese localizations by Ryugi Yanagisawa.
MacOS X 10.0 or later
*Previously available here