People at Convox[1] and Remind101 are doing similar open-source work.
Convox's business model is selling you the managed version of their open source rack. We've been using Convox in production for over 3 years now and we've had pretty good success with it. It's not perfect but the UX improvement for developers when building docker images, promoting new builds or rolling back cannot be understated.
Remind101 has built Empire[2] which is not a product they actually sell but rather the tool they use internally and have decided to open-source it. Empire is a little less managed and while it allows you to run services on it it requires you to have your own solution for building and hosting docker images.
[1] https://convox.com/, https://github.com/convox/rack
[2] https://github.com/remind101/empire