There was numerous middleware and game engines made for the Wii, however we don't have most of it. Many of these have been found to exist thanks to press releases.
- 3DVia Virtools (PR)
- Anvil
- Autodesk HumanIK (Character animation)
- Bink (Video player)
- CRIWARE
- Crystal Tools
- ego
- EMotion FX (Character animation) (PR)
- Fonix VoiceIn (PR)
- Gamebryo (PR)
- Havok (PR)
- Infernal Engine (PR)
- IW engine
- iZotope (PR)
- LiveMove (Wii Remote motion control library by AiLive)
- Mobiclip (Video player)
- Mono (.NET framework implementation) (Link)
- Motion Portrait
- Morpheme (PR)
- MT Framework
- Neova CoreEngine (PR)
- Net-Z (PR)
- NintendoWare (First-party tools to create sound, 3D models, layouts, effect, etc.)
- Nvidia PhysX (PR)
- Omegame Menus Master (PR)
- Q (PR)
- Quantum3 (PR)
- RenderWare
- Rendez-Vous (PR)
- Rockstar Advanced Game Engine
- Scaleform GFx (PR)
- ShiVa
- Spark! (PR)
- Torque (PR)
- TOSHI
- Unity
- Vicious Engine (PR)
- Vision
- VoiceIn (PR)
- Wwise
- Xaitment (PR)