Ultrastudio.org was an educational site built along the lines of “encyclopedia that anyone can edit” with content
interactivity enhancements - currently Java applets, collected from the Web in case they source code have been released under Free license. All applets were newly rebuilt from the source, using both manual review and automated scans against malicious code (no any was found, in open source probably not likely). A server side build, checkup, reviewing and approval chain was constructed to be sure applets are only uploaded in the source code and can only be lauched upon approval.
The project currently hosts about 200 different Java applets, along with they source code. Unfortunately, they are no longer easily runnable after Oracle has disabled running of unsigned RIAs also in the sandbox. Attempts to obtain the code signing certificate (with the goal of running in the same sandbox as before) were not successful as this initiative is not a company and not an organization.
As a result, the project is largely over now, but may have some historical significance. As long as the server still running, it may be used with Free Java applet viewers capable to disable securely and consistently all network and filesystem access.
License: Any FOSS (agregate project)
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!