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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.
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SSVOpenHexagon
C++20 FOSS clone of "Super Hexagon". Depends on SSVStart, SSVEntitySystem, SSVLuaWrapper, SSVMenuSystem, JSONcpp, SFML2.0. Features JSON/LUA customizable game files, a soundtrack by BOSSFIGHT, pseudo-3D effects.
0ad https://play0ad.com
Battle of Wesnoth - https://github.com/wesnoth/wesnoth
Endless Sky. Not sure how welcoming they are to newcomers, but it's certainly open source C++.
My Open Hexagon project is a FOSS game inspired by Super Hexagon which is under active development. You can find the repository here: https://github.com/SuperV1234/SSVOpenHexagon/