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projectm
projectM - Cross-platform Music Visualization Library. Open-source and Milkdrop-compatible.
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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.
There's a service meant to revive the creativity of Geocities called Neocities. https://neocities.org/
If you're on Android, download YouTube Vanced.
When I switched to Linux, I started using Audacious, which has a Winamp mode and even supports Windows skins. It's ultimately a fork of XMMS - which will probably cause the same feelings of nostalgia for those who used Linux around the turn of the century.
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.