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ESP8266Audio
Arduino library to play MOD, WAV, FLAC, MIDI, RTTTL, MP3, and AAC files on I2S DACs or with a software emulated delta-sigma DAC on the ESP8266 and ESP32
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
https://github.com/earlephilhower/ESP8266Audio I useed this lib for some projects, it supports various audio formats (mp3, aac, midi...) and has many output methods (i2s, sigma delta with only one transistor...), It's great.
NOTE:
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Hence, a higher number means a more popular project.