It may be better known under its pre-acquisition name Bitsquid, made by a swedish company called Fatshark. I think the engine part of the company was split off

It may be better known under its pre-acquisition name Bitsquid, made by a swedish company called Fatshark. I think the engine part of the company was split off and then sold to Autodesk. Still, certainly not one of the most popular game engines (of course popularity isn't necessarily the same as being the best)