Dev:Open Source Projects

Here is a list of some open source software available for jailbroken devices. See TheiPhoneWiki for a list of open source jailbreaking tools.

A bit of background information: If a project does not explicitly have a license that gives you the right to use its code, that means it is copyrighted by the developer and you can't use its code in your own projects - in other words, you can read it and learn from it, but don't copy and paste it. If you've published a project that does not have a free license, and you'd like people to be able to use your code if they want to, How to choose a license for your own work and Choose A License may be helpful.

Tweaks
Also check out TweakWeek for a long list of relatively simple open source tweaks, organized by rpetrich.