TCL Developer Studiohttp://kakunin.chat.ru/tcldev/
HJG 2014-03: still at version 1.0, dated 12.07.1999.
EMJ 2014-03-31: Actually there is a later version (22 Feb 2001!) at
http://kakunin.chat.ru/tcldev2/index.html
(the link to it is the word "Here" on the original page, so not altogether obvious!)