This is a growing list of Graphical User Interfaces (definition at Wikipedia) designed for operating OpenFOAM.
A separate list of preprocessors and post-processors is available here: Other Software
1 Commercial:
- Symscape
- Beta CAE
- Icon
- CASTNet
- BlendMe
- Helyx
- HVAC Tool - a GUI for Building Simulation and HVAC Engineering with OpenFOAM
2 OpenSource: