[kaspiCZ]

In case it might help you:

For projects where there's possibly only a dev or two and the project/client, we had success with producteev. It's much less complicated than e.g. JIRA.

If you set up rules for tags and priorities you can manage delivery quite well with it.

Highest priority is reserved for blockers.

Sample of our tags: affects customer, bug, feature, change, production, technical debt