- Resizable side bars with different panels.
- In each panel different options can be set.
- One or multiple large centered viewports with which the user can interact.
- Top menu bars with entries such as "File > New File..."
After searching for half a day I'm kind of confused since there are so many frameworks/toolkits/libraries etc. Angular, Ember, Backbone etc. are often mentioned, but I'm not so sure if that's what I need.
The framework(s) should be free.