Vulkan-based implementation of D3D9, D3D10 and D3D11 for Linux / Wine
Dust3D is a cross-platform open-source 3D modeling software
FlightGear Flight Simulator: free open-source multiplatform flight sim
3D Engine c++
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
Zoomable user interface (ZUI) with file manager, file viewers and more
3D modeler, 3D game maker, 3D demo maker
LDraw™ editor for LEGO® style digital building instructions.
High-efficiency minimalist C++ wrapper for OpenGL 4.3
Vivid is a modern C++ 3D engine using OpenGL4+
Viewer and exporter for Unreal Engine 1-4 assets
An open source VR headset with SteamVR supports for $200
3D representations of flowers, flower elements, bouquets or meadows
Lightweight and modular C++11 graphics middleware for data and games
Cross-platform 2D and 3D game engine