Tcl programming language family

scripting language

GUI toolkit or framework

object-oriented extensions for the Tcl programming language

XOTcl is an object-oriented extension for the Tool Command Language created by Gustaf Neumann and Uwe Zdun. It is a derivative of MIT OTcl and is based on a dynamic object system with metaclasses influenced by CLOS. Class and method definitions in XOTcl are completely dynamic. The language also provides support for design patterns through filters and decorator mixins.

rattleCAD is a parametric 2D computer-aided design (CAD) software specific for bicycle design, in particular for design bicycle frame, developed by the Austrian cyclist and programmer Manfred Rosenberger since 2008. The application is written in the programming language Tcl using the Tk-based graphical user interface (GUI).