While b4 started out as a way for maintainers to retrieve patches from mailing lists, it also has contributor-oriented features. Starting with version 0.10 b4 can: create and manage patch series and cover letters track and auto-reroll series revisions display range-diffs between revisions apply trailers received from reviewers and maintainers submit patches without needing a valid SMTP gateway These features are still considered experimental, but they should be stable for most work and I'd be...