Soft Body Physics w/ Velocity Verlet
Glop-c is an open source C engine for simulating deformable soft bodies in 2D. It's developed by Sam Murray under the MIT License (MIT). While this license does not require acknowledgement, I would appreciate a credit to Glop-c in your product.
Run the following code:
git clone https://github.com/samsface/glop-c.git
and copy the header and c files to you source code tree.
Run make test
to compile and run the test environment.
Full documentation can be found here.