Hack n Plan for Game Dev
So, Jira is pricey and the very idea of renting software gives me hives.
Hack n Plan seems to be popular with the indie game dev crowd. They have a free tier. Everything looks good and, although agile-y and kanban-y doesn't force you too hard into one methodology or another.
If it were self hosting I'd use it every day. But, hey! Free tier!