Chipmunk2D
An open 2D rigid-body library focused on speed and simple integration, with shapes, constraints, queries, and sleeping.
Why use it
Small engines and mobile games gain a compact runtime plus bindings for many languages.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
Its cadence is stable rather than rapid; validate complex continuous collision and unusual geometry with project cases.