Dust3D
Dust3D is a quick 3D modeling software for game developers
Castle Game Engine
Cross-platform (desktop, mobile, console) 3D and 2D game engine. Visual editor. glTF, X3D, Spine. Modern Pascal code.
glTF for UE4 & 5
Best glTF importor for UE4/5 editor. https://github.com/code4game/glTFForUE4
GLTF Level Importer Addon for Godot
Build entire levels in Blender by placing Scenes, and converting Blender functionality to Godot.
Castle Model Viewer (formerly view3dscene)
Viewer for many 3D and 2D model formats: glTF, X3D, VRML, Collada, 3DS, MD3, Wavefront OBJ, STL and (2D) Spine JSON
FBX to GLB: One-Click Character Batcher & Fixer
Batch merge animated FBX files into a single GLB.
ModelView (Quest)
3D model viewer for Quest.
Tidy Monkey
Tidy Monkey: Your Swiss Army Knife for Blender Workflow Optimization
GLTF to HTML5 ZIP Converter
gltf html5 zip converter