Xonotic
A free arena shooter in the Quake lineage, built around movement: strafe jumping, ramp physics and the grappling hook. Every balance constant in the game is published in plain text under the GPL, which makes it the most transparently tunable competitive shooter available.
Xonotic is what happened after the Nexuiz project fractured in 2010: the community forked, kept the GPL, and rebuilt the game around movement. Strafe jumping, ramp acceleration and the grappling hook are the mechanical core, and the arsenal is designed so that every weapon has a role in a movement fight rather than a damage-per-second ranking.
The thing that makes it unusual as a data subject is that Team Xonotic publishes the entire balance model as plain text. There is no reverse engineering step and no datamining question. `bal-wep-xonotic.cfg` is a flat list of named constants, one per line, under the same GPL that covers the rest of the source. When the community argues about a nerf, they are arguing about a file anyone can read.
PVPWire serves those constants restructured: per weapon, split by fire mode, so primary fire can be compared across the whole arsenal without string handling. The player-level file is served alongside it, covering health and armour regeneration and decay, fall damage, powerup durations and the grappling hook physics.
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