currently it is only hard to find out which module has which 3rd-party-tool dependency. For the repo and other purposes it would be good to know which module needs which 3rd-party tool. At the moment it is even unclear which 3rd-party tools are still in use.
This should probably be somewhere in the developer wiki.
I've had a go at this here:
At the moment we don't seem to have anywhere better than "Working Documents" on the Dev wiki for documents describing the system.
Looks good to me. I'm going to try and break this down further/better eventually, so let's leave this open.