Commit Together by Github - Now add co-authors to your commits

Tweedle App - Notion is nice but sometimes all you need is an app like Tweedle.

Commit Print - Posters of your git history

Plume - App for writing documents, scripts, books and more.

gitbird - So, I don't always remember to tweet what I do, but commit my code often, and what do users love more than your product?

Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.