The Portable Freeware Collection Forums

http://www.codelite.org/

CodeLite is an open-source, cross platform IDE for the C/C++ programming languages (build and tested on Windows XP SP3, Windows Vista, Ubuntu 9.10, and Mac OSX 10.5.6). CodeLite is distributed under the terms of the GPLv2 license

Can be portable, as in the following forum post:
http://codelite.org/forum/viewtopic.php?f=11&t=893

This does not appear to work anymore, it writes to %AppData% now.

I have posted a request for new instructions from the developer in the CodeLite forums.