DIRT is a directory of digital research tools primarily aimed at the humanities:
http://dirtdirectory.org/

They have metadata guidelines for tool entries:

http://dirtdirectory.org/metadata-guidelines
https://docs.google.com/spreadsheets/d/1Z8-b-LkchyvrmTQHI1GMsJNEWp2IEqLNePhGj-47PXY/edit