Swan — Open-source topology optimization toolbox

Of course, Swan is capable of solving topology optimization problems like other commercial software. Some additional features that make it stand out are:

Usage of varied constraints that allow tailor-made solutions
Possibility of using different optimizers for the same problem

Topology optimization example — Topology optimization of a 3D bridge.

These designs are also easily exportable, making Swan the ideal toolbox to design your pieces and 3D-print them directly.