Cloud 66 for Rails allows you to build, manage and maintain your Rails applications that can be deployed to any cloud provider or to your own server. Cloud 66 for Rails helps you scale your database with master-slave replication, without having to make any configuration changes. You can add back-ups, load balancers and de-commission servers with a single click. Popular Rails and Rack frameworks available.

Gitpod enables you to be always ready-to-code.

It launches a complete dev environment for any GitHub project, by simply prefixing the GitHub URL with gitpod.io/#.

With Gitpod your team can instantly start coding with fresh, ephemeral and fully-compiled dev environments for each new task - no matter if you are building a new feature, want to fix a bug or do a code review.

Sounds like GitHub Codespaces? https://www.gitpod.io/gitpod-vs-codespaces/