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Cataclysm-DDA
Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.
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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.
Battle for Wesnoth - free https://www.wesnoth.org/
Also, there is a fork of Cataclysm which works better for me and a lot of other people: Cataclysm: Bright Nights.
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.