Forum OpenACS Q&A: Response to Knowledge management module status ?
makes a KM application available as part of the ACS, there are
many in the community who are eager to jump in and work on
I agree with Ben, though, that it would make sense to develop on
OpenACS if the project is being done in 4.x Tcl. You'll get a lot
more community support that way, since OpenACS Tcl has a
future while ACS Classic Tcl doesn't.