descent3

The game takes place in a science fiction setting of the Solar System
where the player is a mercenary and must stop robots infected by an
alien virus.
The player controls a flying ship in zero gravity with a six degrees
of freedom movement scheme. The game features both indoor and outdoor
environments, made possible with the use of a hybrid engine that
combines the capabilities of a portal rendering engine with those of
a flight simulator-like terrain engine.
There is a single-player campaign mode and an an online multiplayer
mode where numerous players can compete against each other in
different game types.

          

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License: GPL-3.0-or-later
URL: https://github.com/DescentDevelopers/Descent3