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InfluxDB
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Not all games are listed there. There's also Stardew Valley and TMNT Shredder's Revenge (see retrogamecorps.com) and Panzer Paladin (https://github.com/JohnnyonFlame/FNAPatches/tags), which are not flawless but playable, assuming you own the game files. Played all of them for a few hours on my handheld.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.