Description:

OTcl, short for MIT Object Tcl, is an extension to Tcl/Tk for
object-oriented programming.

Some of OTcl's features as compared to alternatives are:

* designed to be dynamically extensible, like Tcl, from the ground up
* builds on Tcl syntax and concepts rather than importing another
language
* compact yet powerful object programming system (draws on CLOS,
Smalltalk, and Self)
* fairly portable implementation (2000 lines of C, without core
hacks)