Basecamp, Bugzilla, Redmine, a wiki, anything else. But there's a worse Jira than Jira with the Azure Dev Board.

A TODO file in Git.

Seriously, though, having your software enforce too much prescriptive workflow on you is dramatically worse than having it enforce too little. Historically it was common for every software team to write their own bug tracker for this reason.

Github Issues, Linear, or ClickUp

Bugzilla is still around.

Phabricator?

Bugzilla