Bug tracking
Bugs need to be tracked somewhere. You want to know what the problem is, how to recreate it, the conditions (version, operating system, hardware), who might be working on it, and the status.
It’s a similar set of information for tracking regular work tasks. I’ve used Bugzilla, DevTrack, JIRA, probably more I can’t recall, and unfortunately spreadsheets. Some companies have written their own; for example, Google has at least two (Monorail and then Google Issue Tracker).
It’s convenient when automation is introduced so you can link commits to tracked issues or ingest new issues with a lot of context automatically collected.
Have you worked with a bug tracker you liked using? What was your favourite part?