I was suggested to post this in the tracker.
The idea is to be able to add several clickable labels to each repository, enabling to view all repositories of a certain user that have a certain label. Pretty much like GitHub's "topics" - for example these are my repositories which have the label "love2d" in GH:
and I can also list those which are love2d games specifically:
Searching for two labels at a time might be harder UI-wise without a search box, but it would be nice to have at least the possibility to add labels and list the projects that have one specific label.
This is upstream 1253. There's a very recent PR added, and it looks like it will soon be accepted.
anything non-odious that makes it into the upstream gogs will be merged into notabug eventually