Relational programmable database with GUI
MUIbase (Magic data BASE with User Interface) is a relational programmable database with user interface for Windows, Mac, Linux and Amiga.
Hero's Union: Basic Information Library System is a project that is in the early stages of development. This system will implement some of best features available through other ILS software as well as many new features. Team Members Wanted!
RSLisp is a new dialect of Lisp which works on the NET Framework with a special compilation/interpretation model. If you wish you can download the source and build it yourself for Linux (requires Mono Framework), but I don't promise that it'll work
methbrowse is a new XHTML-only web browser built from the ground up for speed and compact memory usage in Haskell. It will use a custom written HTML rendering engine. Plugins and extensions will be supported via the Lisp and Python languages.