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RGBtoHDMI
Bare-metal Raspberry Pi project that provides pixel-perfect sampling of Retro Computer RGB/YUV video and conversion to HDMI
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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.
It's very DIY, and doesn't see much love from the Apple community, but RGBtoHDMI has a great support community. It seems that Raspberry Pi Zeros are back on the market again, too
The OSSC does this since revision 1.6 and is described pretty well in this guide https://junkerhq.net/xrgb/index.php/OSSC
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.