Instigate GUI Toolkit is an Abstraction for multiple GUI Toolkits allowing to write single GUI code which can run on multiple platforms and with multiple GUI back-ends. Now it supports QT and gtkmm back-ends on Linux. Work on GTK+ and EWL is ongoing.
Scanner Access for Tcl
Tcl extension that aims to provide platform- and device-independent access to scanners and other image acquisition devcies.