Are you looking for a home where you can discuss development of companion products and utilities, a repository to upload/download them, or both?Setting up and moderating a discussion forum is one thing, but managing a file repository is yet another. For a download area, you could ask Henri if he would post your program/utility in http://kixtart.org/downloads.html, or there's always the parallel KiXtart universe download area KiXtart Download Zone
If it's a discussion area, I don't think the volume would warrant one. There are may cases where discussions start out as "how do I... in KiX" and end up with a suggestion for a 3rd party utility, and just as often, the inverse.
I think the moderators have been very tolerant of off-topic threads and as long as they remain pertinent to the KiX community, I see no reason why we cannot continue. Simply prefixing the topic should suffice. It is not inconceivable that some of the tasks we rely on 3rd party addins for, may one day be incorporated directly into KiX.