"Dqkit is like tclkit on steroids. It incluldes tcl, tk, [ metakit ], vfs, zlib, tclx, itcl, itk, iwidgets, blt, tbcload, tclsqlite and openssl+tls", according to fan Bob Techentin. It also includes threading. Created by Wojciech Kocjan, it's available through Sourceforge [L1 ] and [L2 ].
[Also funny is that the source doesn't seem to be available]