Tremulous (Web)
The open-source humans-vs-aliens shooter, in the browser.

One destination, checked by hand.
The free open-source humans-vs-aliens hybrid (GPL code, CC BY-SA data per the page) with full keyboard and touch controls documented.
Open and play at the host ↗External host · No game files supplied by Radiant Guide · Not a gameplay test
Requirements
The host documents play directly on its page — read its current instructions before starting.
Status from our October recheck
The free open-source humans-vs-aliens hybrid (GPL code, CC BY-SA data per the page) with full keyboard and touch controls documented.
Sources and limits
Checked October 14, 2026: the original destination and the @RadiantOpti links reply. We have not completed a gameplay session, tested every device or verified server populations.
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