[oevi]

ProjectOpen [1] could be an example. But from my experience it is basically a legacy project used in (large) companies, because it filled a gap 15 years ago when web based PM software was still rare.

The funny thing is, that the use of Tcl is explicitly advertised as security through obscurity:

"The combination of AOLserver and the TCL programming language is not commonly found in the Internet, so a potential hacker will need to expend a considerable amount of criminal energy in order to reverse-engineer the application stack." [2].

[1] http://www.project-open.com [2] http://www.project-open.org/en/project_open_architecture