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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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warzone2100
Command the forces of The Project in a battle to rebuild the world after mankind has been nearly destroyed by nuclear missiles. A 100% free and open source real-time strategy game for Windows, macOS, Linux, BSD+
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
There's Tuxemon, it's in the alpha/beta state, and it's an alternative to pokemon.
Mudlet is a nice open-source client for playing online text games with, too.
what about Mindustry?
Maybe we could start a list somewhere (reddit wiki?). Another one i know of that isn't mentioned here yet is Battle for Wesnoth, it's even on steam.
Warzone 2100, a post-nuclear 3D RTS that is a lost of fun, originally a commercial game ~20 years ago but it has been fully FOSS since 2008
0 A. D. (as you mentioned) a really impressive 3D RTS that beats a lot of commercial ones IMHO
Flare, a nice 2D RPG