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Playnite
Video game library manager with support for wide range of 3rd party libraries and game emulation support, providing one unified interface for your games.
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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.
For library management - not just launching - I'd always recommend Playnite even if 99% of your games are on Steam.
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.