Blender free FBX Export Addon for Game Assets - BlenderNation
I've created an FBX exporter for Blender that exports FBX files compatible with Unity's coordinate and scaling system. No more unwanted rotations, no more clutter with FBX options, no need to modify
Better FBX Importer & Exporter - Blender Market
HowTo/Export from Blender using FBX - TrainzOnline
How to include unused/unassigned (or multi-slot) materials in export to FBX in Blender 2.8 - Blender Stack Exchange