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UltimMC
Discontinued Cracked Minecraft launcher. Not related to the original developers. [Moved to: https://github.com/UltimMC/Launcher]
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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.
I'd say MultiMC Cracked (or UltimMC, link here: https://github.com/AfoninZ/UltimMC It is open source, and I really like the multiple instance management thing and GUI of the launcher.
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.