Open-source alternatives to Heroku

3 community-reviewed projects you can use instead of Heroku.

1. CapRover - CapRover is a free, self-hosted platform-as-a-service built on Docker, NGINX, Let's Encrypt and Docker Swarm, with a web dashboard, a deploy CLI, one-click apps and automatic HTTPS for Node, Python, PHP, Ruby, Java and containerised apps. (Licence: NOASSERTION)
2. Coolify - Coolify is an open-source, self-hostable platform-as-a-service that deploys web applications, static sites, databases and 360+ one-click services to your own servers over SSH, using Docker, Git-based workflows and automatic SSL. (Licence: Apache-2.0)
3. Dokku - Dokku is the smallest open-source platform-as-a-service implementation, powered by Docker: install it on any Linux server and deploy Heroku-compatible applications with a simple git push, using Heroku buildpacks and isolated containers. (Licence: MIT)