- STLSoft 1.9 - STLSoft 1.9 branch, now very old - venerable - and soon to be end-of-life;
- STLSoft 1.10 (delta) - the deltas-only 1.10 branch, which contains nuggets of what will become 1.12 in the coming months. Being an deltas-only, you need to install in conjunction with STLSoft 1.9, either with interpositioning or overlay.
Fork away!
