EDE (Equinox Desktop Environment) is simple, fast, and user-friendly environment. It works on all popular Unix and Unix-like operating systems.
STk is a free R4RS Scheme interpreter which can access the Tk graphical package. Concretely, it can be seen as the standard Tk package where Tcl has been replaced by a Scheme interpreter.
Java-based object oriented querying.
An easy-to-read, HTML-based, mostly logic-less DOM templating engine.