I’m proud to announce another plugin of mine. Inspired by wanting to be able to use my Checklist plugin collaboratively with other people, I created the Shared Edit Plugin. Once installed and enabled (see installation section of the readme), another action appears on ones posts allowing to share the permission to edit the post with other users:
Once saved, those other users will be able to edit that post, too. Also allowing to check the check boxes of the checklist plugin. Of course their changes will show up in the normal history.