I started using Metroretro a few months ago and it's really nice, except for the ability to export retro items I think it covers everything you listed. Also it's free and it comes with some useful templates. Source: about 3 years ago

To improve the developer experience, I needed to understand the real problems the engineers were facing, so I scheduled a brainstorming meeting. In this meeting, I explained my project and shared a Metro Retro board to write down all issues our application had at that time, what was the bad DX we had, and doubts related to this application (e.g. How do we handle data fetching?; how do we handle error handling?;... - Source: dev.to / about 3 years ago

There is a word filter you can set up, if you have better ideas or something that exists on reddit submit an issue here , maybe set up a bounty on rysolv or donate because I worry they won't have the resources to handle all this popularity. Source: 12 months ago

In my opinion it isn't marketed well, if a highly popular project will have a link to rysolv on it's website and github page it could get a decent amount of contributions and iirc there was at least one big project that was funded using bounties. Source: about 1 year ago

Better to ask in the community of the implementation, and the best option is probably a bug tracker (adding a bounty on a platform like rysolv could also help). Source: over 1 year ago

A while ago I went over these types of platforms, the best IMO is rysolv. Source: over 1 year ago

Rysolv can also show the most funded issues on the platform and per project (and is last I checked the best open source platform for bounties), it can also be a "low cost" improvement, all you need to do is link to it on the KDE website or the readme of some projects. Source: over 1 year ago