The Grand Compendium
Digital Devil Saga Series Spreadsheets
A duology of spin-off games that plays more like a traditional JRPG, abandoning staple mechanics such as demon negotiation and fusion. These games reuse the Press Turn battle system introduced in Shin Megami Tensei: Nocturne and later reused in the Shin Megami Tensei IV duology. I have yet to play either of these.