GG classic likes DBO, X, FBX (via importer). I have used Fragmotion/UU3D/Gamespace/Truespace/Blender, but I don't class myself as a modeller. GG Max (TGC's new baby), imports FBX,OBJ, X, DBO, GLTF + others I can't recall, although GG Max is still in development.
Professional Programmer: Languages- SAS (Statistical Analysis Software) , C++ VS2019, SQL, PL-SQL, JavaScript, HTML, Three.js, others
Hardware: ULTRA FAST Quad Core Gaming PC Tower WIFI & 16GB 1TB HDD & Win 10 (x64), Geforce GTX1060(3GB). Dell Mixed Reality VR headset, Aerodrums 3D