I'm looking to make a 3d data visualization tool.  I want to select a library, game engine, or framework that would do most of the work for me.  Desired features:
1. Be free/open source software that runs on linux
2. Display 3d shapes (colored planes/boxes, arrows) based on data sourced in real-time from another process
3. Display labels in 3d space
4. Easily allow the user to adjust camera view
5. Include UI controls: buttons, sliders, text boxes, etc.
6. Allow the user to click on objects to select them and adjust their properties using the UI controls, or drag the object to move it.
7. The software it would interface with is written in C++, but the library doesn't have to be C++.  I'd be happy with C++, python, or HTML5.