A bookmarklet for generating changelog lines from GitHub pull request and commit pages (including links to all mentioned issues and a link to the author in case of pull request) — saves a lot of time managing the changelog. Just save as a bookmark, click while you're on a pull request page and copy the text.
Doesn't include the pull title as I prefer to write description in my own words, but the bookmarklet can be customized quite easily. Also, doesn't include author name on commit pages (as they're usually commited by me). Example generated string:
(by [@kristerkari](https://github.com/kristerkari)). [#1607](https://github.com/Leaflet/Leaflet/issues/1607) [#1288](https://github.com/Leaflet/Leaflet/issues/1288)