Chess Database Application
Scidb is an open-source chess database application for Windows, Unix/Linux. It is a new development inspired by Scid.
ChemVisio is software which might be useful for educational purposes (non-organic chemistry, crystallography etc.). It might be a good visualization support for all people who need better illustrations than that you could see in books.
Small framework working over SDL libraries to develop small and simply 2D games
FTclP is a FTP client written in Tcl-tk. It aims to provide a lightweight, easy to use, gui-based ftp client for several operating systems/architectures.
Tcldrop is basically a clone of the Eggdrop IRC bot, but is being written purely in Tcl. The intention is to write a much more scriptable bot than Eggdrop is. It will run stand-alone or from any Tcl-enabled application (Tcl v8.5+).