I am project lead on the Eclipse Requirements Modeling Framework (RMF),
which also contains a tool called ProR for requirements engineering (http://eclipse.org/rmf).
In two weeks, we'll start a sprint to improve the GUI. We welcome
feedback, so that we can prioritize properly before starting the sprint.
More details can be found here:
We appreciate any feedback!
BTW: You can subscribe to our newsletter to receive regular updates regarding ProR and RMF.