The best Game Development alternative to Blender is Armory 3D, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Blender and seven of them are Game Development Tools so hopefully you can find a suitable replacement. Other interesting Game Development Tool alternatives to Blender are Range Engine, Zmodeler, Grit Game Engine and DX Studio.
Armory is an open-source 3D game engine with full Blender integration, turning it into a complete game development tool. The result is a unified workflow from start to finish, making you work faster. No more jumping between different applications.
Range Engine is a light and powerful game engine and 3D software, made based on Blender Game Engine with improvements from UPBGE.
ZModeler (or Zanoza Modeler) is a 3D modeling application. It is aimed at modelers who model for computer games such as 18 Wheels of Steel, Grand Theft Auto, Need for Speed, Midtown Madness or similar video games.
The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua. It supports huge open world maps and dynamically streams assets from disk. The Grit Game Engine is a community project to build a free game engine (and toolchain) for implementing...
DX Studio combines the latest in real time 3D graphics technology from industry and gaming with rapid application development tools in a powerful 3d engine.
Awakening is a powerful professional real-time 3D solution. With it, you can easily create eye-catching interactive 3D presentations, brief films, games...
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Armory3D is a game engine that runs inside of Blender, so it doesn't count as alternative to Blender.