hi,i think this would help:
make a license category, so that people
could surf the open ource engine only.
i got nothing to do with commercial engines.
Goto advanced search, and use the range 0 to 0 for price and you'll get only open-source/freeware engines.
though you also get "not public" engines as well.
that was me, wasn't logged in, sorry. This is still a valid question that jokerar poses.