Created by Jeff Lindsay in 2013, Dokku is an open-source (MIT) mini PaaS built on Docker, known for git push one-click deployment and Heroku Buildpacks compatibility, ideal for self-hosted single-server application platforms.
Fly.io is a US edge application deployment platform that runs Docker containers on 35+ global edge nodes for extremely low access latency, supporting direct deployment from Dockerfile or Git with automatic SSL, load balancing, and scaling, plus a generous free tier for individual developers and small projects.