Software
Blender
A free and open-source 3D computer graphics software tool set. Blender constantly changes (usually for the better). It has support for gLTF models but export is buggy and geometry falls apart so exporting to a format that's better supported like OBJ or FBX.
Blender extensions / plugins
Generative tree setup used for generating objects for ../sections_across/networked_scultpure/../ exhibition in Jul 2023. - Albero (link to Gumroad - not free). Differential Growth was also used a lot during research for that exhibition but the models didn't make the cut.
Converters and tools
FBX2gLTF
A command-line tool for the conversion of 3D model assets on the FBX file format to the glTF file format by Godot engine (an open source game engine).
obj2gltf
Convert OBJ assets to glTF 2.0.
obj2gltf -i obj.obj -o gltf.gltfgltf-pipeline
Content pipeline tools for optimizing glTF assets by Richard Lee and the Cesium team.
(compress with draco)
gltf-pipeline -i uncompressed.gltf -o compressed.gltf -d