Here's a non-exhaustive list of previous OpenSource projects that are no longer developed nor maintained.
Please take a look at the projects page to see the list of the active OpenSource projects by XS-Labs.
Codeine is a new code editor for Mac, allowing editing, building, running and debugging C, C++ and Objective-C code. While not an IDE (yet), Codeine aims to evolve to support complex application projects.
FileSystem is an application that allows you to browse the content of your iPhone disk, displaying file and folders, files contents, and detailed informations about file and folder permissions.