SDL Framework (SDLFW)
SDLFW is a cross-platform framework from the powerful SDL library to create your own 2D games with the Lua programming language.
It's easy-to-use, free, open-source, and works on Windows and Linux.
Web OS to host web based applications. An API allows to create online applications. Uses web 2.0 techniques. Integrate existing web apps. Featuring: GUI, icons, tasks, users. Office apps: oulook, CRM, browser, browser, post-it, mail.
Terra-Terra is a virtual operating system, giving the full power of an OS to your internet server. Application developers can build webbased application for Terra-Terra, using its user interface, security system, RTL etc as with any OS.
Sakura is a Knowledge Navigator and User Interface for UNIX, which implements HyperMedia and its own windowing and packing system, both in the main program and in an extensive API for Tcl and other languages.