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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.
In either case, you can use any library capable of I2S output. This one is rather simple to use and supports lots of different formats, and can play sounds from the internal filesystem (so you won't need an SD card if you can fit everything in 1-3 MB). It even has support for streaming web radio and a MIDI synth.
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.