Render, founded in 2019 in San Francisco (YC S19), is a unified developer cloud PaaS offering one-click deployment of static sites, web services, PostgreSQL, Redis and cron jobs, with a free tier of 750 instance hours per month and widely seen as a modern Heroku alternative.
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.
Coolify is an open-source self-hosted PaaS from the Hungarian team coolLabs that deploys apps and databases with one click; 491,197+ self-hosted instances run 280+ one-click services.