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v-wordpress-plugin-updater
A WordPress mu-plugin and a self-hosted PHP API with web GUI to update WordPress plugins from your own server.
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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.
Personally I have a hook in my plugins that trigger when WP checks for updates. You can see a code same for one of them on my github, https://github.com/greggoryhogan/gutenberg-gifs/blob/master/includes/update.php but Misha Rudrastyh has a great writeup that I based mine on, https://rudrastyh.com/wordpress/self-hosted-plugin-update.html
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.