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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.
The ones I know of are listed in: https://github.com/OnionUI/Onion/wiki/Ports-Collection as well as the list at the bottom of this page: https://github.com/OnionUI/Onion/wiki/Third-Party-Apps#additional-ports-and-standalones
steward-fu's grab-bag
And there is a diablo port : https://github.com/Brocky/devilutionX
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.