This is a program very similar to other expensive Live Support Chats, xHTML and CSS compliant and...
Free and GPL.
It has also a WinApp but that is neither free nor GPL (but not too expensive).
This is memes.net. It's running an online note-taking application which uses PHP and mySQL. The application is called Lucid Fried Eggs, Lucid for short.
Use the parent, child and jump links above to navigate around. Feel free to add notes or modify the text of existing notes. Be nice to each other and don't mess up other people's posts too much, and don't delete notes unless you created them.
this is a technical collaboration website. it's geared towards non-googleable, hard to find technical knowledge. It also has a wiki tips section where I'm planning to put all the tips and my experiments with tikiwiki.
e.g. latest tip about "how to add abdreas style logo to tiki stylesheet!!"