Keeping track of notes, statuses, and all the minutia of RPGs
Many players and GMs find themselves needing help organizing game materials: characters, story points, campaign events, miniatures, &c.
Questions should not be specifically stated as tool-requests, as those are off topic. However, answers may certainly recommend a tool--see the above-linked meta post for discussion.
Answers should be based in actual experience; pure idea-generation is not a good use of SE's Q&A format.