Atlantis vs Catalyze: What are the differences?

Atlantis: Open Source PaaS Built on Docker, by Ooyala. Atlantis is an Open Source PaaS for HTTP applications built on Docker and written in Go. It makes it easy to build and deploy applications in a safe, repeatable fashion, and flexibly route requests to the appropriate containers; Catalyze: HIPAA-compliant cloud computing for healthcare. Cloud tools for healthcare. We provide a HIPAA-compliant Platform as a Service (PaaS), HIPAA-compliant Mobile Backend (BaaS), and HL7 integration services. Focus on building your digital health app, and not on compliance. Think of us as your healthcare-specific DevOps team.

Atlantis and Catalyze can be categorized as "Platform as a Service" tools.

Atlantis is an open source tool with 381 GitHub stars and 33 GitHub forks. Here's a link to Atlantis's open source repository on GitHub.