- Ellogon - A natural language engineering platform (LGPL) [http://www.ellogon.org].
- TileQt - A tile theme that uses Qt/KDE for drawing (BSD) [http://www.ellogon.org/petasis/index.php/tcltk-projects/tileqt].
- TileGTK - A tile theme that uses GTK+ 2.12 for drawing (BSD) [http://www.ellogon.org/petasis/index.php/tcltk-projects/tilegtk].
- TkDND - A drag and drop extension for Tk (BSD) [http://www.sourceforge.net/projects/tkdnd].
- tBuild - A small Tcl-only extension that provides an interface for building shared libraries from C/C++ under Windows & unix (BSD) [http://www.sourceforge.net/projects/tbuild].
- Toolbar.tcl - A small script that implements dockable toolbars (BSD) [http://www.iit.demokritos.gr/~petasis/Tcl/toolbar.tcl].
- Keyboard.tcl - A virtual keyboard widget (BSD) [http://www.ellogon.org/petasis/index.php?option=com_docman&task=cat_view&gid=33&Itemid=37] (see also the Keyboard widget page).
- TclAgent - An extension for manipulating Microsoft's agents (BSD) [http://www.sourceforge.net/projects/tclagent].
- Various CVS snapshots (tarballs) of Tcl/Tk extensions: [http://www.iit.demokritos.gr/~petasis/Tcl/].
- Updated Tcl backtracking package (bc.tcl) aka Tcl-BC.