- XCallbackURL 84 iPhone app for testing the x-callback-url interapp communication protocol
- TiXCallbackURL 20 iPhone app demonstrating implementation of x-callback-url in Appcelerator Titanium
- URLSchemes 12 Simple iOS app to demonstrate opening and receiving URLs in an app
- Crasher 7 This is an iOS app that does nothing but register a URL scheme, and crash if it's launched using it.
- attachment_fu 2 Treat an ActiveRecord model as a file attachment, storing its patch, size, content type, etc.