Sbignum is a project mainly written in C and TCL, based on the View license.
Old code about C library for big numbers plus Tcl bindings
Note for people from 2011: I don't remember very well the completeness or the quality of this implementaiton. I'm lately trying to put on github everything I coded in the past but I can no longer find in my HD. When I find something on the internet that is possibly something I could reuse or have fun reading the source in 20 years, I put it on github.
Salvatore
tclsbignum - A bignums library for Tcl
Copyright(C) 2003 Salvatore Sanfilippo All rights reserved