
Dmsh: "The worst mesh generator you'll ever use."
Inspired by distmesh, dmsh is slow, requires a lot of memory, and isn't terribly robust either.
On the plus side, it's got a usable interface, is pure Python (and hence easily installable on any system), and if it works, it produces pretty high-quality meshes.
Combined with optimesh, dmsh produces the highest-quality 2D meshes in the west.
Example capabilities: * Primitives - circle, rectangle, polygon - halfspace * Combinations - difference - nonconstant edge length - union - intersection * Transformations - rotation, translation, scaling * Local refinement