codepad - practical when discussing code in chat, as the code is not only displayed but also executed. Therefore, especially interesting for algorithms where you can include the data in the code.
Archive 15. September 2010
Free Pascal - Advanced open source Pascal compiler for Pascal and Object Pascal - Home Page - Blast from the Past. The new 2.4 of Free Pascal supports OSX/Arm as a target. Yes, this is supposed to allow programming iPhone applications - and with the lifting of Apple's tool restrictions, this could almost be realistic (though I don't know how good the integration with Cocoa is). However, I'm not really sure if I would want to deal with Pascal again after all these years.
home | Disco Project - yesterday I already had mincemeat, disco is similar but more advanced if the simple model of mincemeat is not enough.
Lazarus Snapshots - just for completeness: there is also a GUI-IDE like Delphi for Free Pascal, and according to the list of snapshots it also works on OSX (i.e. the Mac, not the iPhone). Those who want to play around with Pascal might be able to get started with the linked snapshots.
octopy - Project Hosting on Google Code - and a small and simple implementation of mapreduce in Python.