Cosmos Cloud looks neat! At a first glance from looking at the web page, it looks more focused on delivering a "personal cloud" or "1-click deploy apps."

Dokploy is more Heroku-styled: while you can deploy third-party apps (it's just Docker after all), it seems really geared towards and intended for you to be deploying your own apps that you developed, alongside a "managed" database (meaning, the DB is exposed in the UI, includes backup functionality, and can even be temporarily exposed publicly on the internet for debugging.)

Coolify feels a bit like a mix of the two deployment models, while Dockge is "bring your own deployment" and Komodo offers to replace Terraform/Ansible/docker-compose through its own declarative GitOps-style file-based config but lacks features like managed databases, or built-in subdomain provisioning.