GitHub - Philipp-Seifried/Blender-Massive-Boolean: Blender add-on that can combine tons of objects, by running clean up steps after each Boolean operation.
modeling - Merge multiple meshes into one single mesh? - Blender Stack Exchange
How to Join & Separate Objects in blender 2.9 - YouTube
Question about how to CORRECTLY export, join objects - Basics & Interface - Blender Artists Community
Merge Vertex, Edge or Face – Blender Knowledgebase
Joining objects in Blender 2.8 causes the objects to disapear - Blender Stack Exchange
How To Join Objects in blender? - Quick tutorial - YouTube
How to Combine Objects in Blender 2.8 Eevee (Boolean, Sub Surf Modifier, Remesh) - YouTube
Blender How To Join Objects - YouTube
3d - How to merge two objects in Blender - Game Development Stack Exchange
Blender 2.8 Character Modeling - Part 2 of 8: How to Join Objects & Sculpt - YouTube
Remove Doubles (Merge by Distance) – Blender Knowledgebase