Recently i've been using kagifeedback.org which is a modified version of a Flarum instance: https://discuss.flarum.org/

It's a REALLY good and modern platform for managing feature requests and such. Very versatile and importnatly: open source!

Flarum really feels like it's what Discourse (the forum software) is to a regular php forum and such. I and I think Flarums is that againt Uservoice. Much more customizable and open source.

Obv: Switching over is going to be a pain, no doubt