As promised here (https://medium.com/design-with-gravit/gravit-will-become-open-source-4608f37aef2d), we've open-sourced Gravit because we believe so much in it we'd like everyone to participate in evolving this beast into something great, something every designer would use world-wide.
The Gravit Repository can be found at GitHub: https://github.com/quasado/gravit
Gravit is available on Mac, Windows, Linux, ChromeOS and the Browser. It is completely written in HTML5, JS and CSS3 nothing else and currently consists of roughly about 115.000 lines of code.
We're inviting everyone be it developers or designers or UX experts in contributing to the project. Now is the time you can shape your own tool for your daily usage.
We're actively developing on Gravit and are planning on a stable, first release by end of September.
Thanks and looking forward to hear from you guys. Alex