No open source community. The laser engraving/cutting community is very (for lack of a better term) cut throat and dog eat dog. It wasnt always that way, when I first got started 6 or7 years ago it was very congenial and full of helpful people. Unfortunately I think when the market got flooded with cheaper and cheaper lasers it became a race to the bottom and the helpfulness dried up.

I use inkscape for my design work. Adobe is also good, but expensive. Lightburn is another good option for both design and running the laser, but I haven't made the jump to that yet.

There are a few really good channels on YouTube that are very helpful. Laser Everything has a ton of very in depth and detailed videos on all aspects of laser work.