CKSource is a
browser extension publisher,
most of their extensions are
developer tools extension.
November 28th, 2022
A WYSIWYG rich-text editor for GitHub issues, comments and pull requests. Powered by CKEditor.
December 18th, 2020
HangHub allows you to see who is viewing or commenting on the same GitHub issue or pull request as you in real time.
You could send emails to publisher.