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esp_8_bit
Atari 8 bit computers, NES and SMS game consoles on your TV with nothing more than a ESP32 and a sense of nostalgia
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InfluxDB
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It's almost certainly an ESP32 in there. They're dirt cheap, have wifi and BT, and have just enough power to emulate some 8-bit systems. They're also very well documented and loads of libraries already exist for the platform, so designing a handheld around the ESP32 would be very quick and easy.
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.