Appcelerator Titanium; open source competitor to AIR?
Titanium allows developers to use native windows, with application and system menus, desktop notification and file system access. It has built in database support and a plug-in architecture to allow for extensions. The packaging process is managed from the command line, which should allow for easier integration with automated tools.
Demos of the technology, including Tweetanium, a desktop Twitter client, Playtanium, a desktop YouTube player and a contact manager are available on the Titanium website, as installable applications or as source code. Appcelerator Titanium is licensed under the Apache Public Licence 2 and has been built using open source components including WebKit, Gears, Chromium, GTK+, jQuery and Ruby as well as Appcelerator's own SDK.