Sega Genesis, part of GameDB.
Genesis.data.json: All data, structured in the JSON formatGenesis.data.tsv: All data, structured in the TSV formatGenesis.release_dates.pdf: Histogram of release dates, stratified by regionGenesis.titles.json: Mapping of serial numbers to game titles, structured in the JSON format
The game folders in games are named after their serial, which is at offsets 0x180 through 0x18D (inclusive) of the ROM, and which can be used to uniquely identify the game.