FREE and OPEN SOURCE with shell: WordOps, SlickStack, Centmin Mod, Webinoly, VPSSIM
FREE and OPEN SOURCE but using containers: EasyEngine
FREE and OPEN SOURCE but using Ansible: Trellis
Strange how many people use WordPress cuz its open source but then use a secret code platform (and pay money for that) to manage WP sites.... do you really want to rely on private API from 1-2 guys for all your sites?
Cuz that is what you got with any paid Saas script--- Runcloud, Serverpilot, Gridpane, Moss, Ploi, SpinupWP
What if you need to move to a new cloud? What if they spy? What if they ban you? What if they disappear? What if you want any datacenter in the new city? Those API Saas can support only few datacenters.
Better you have 5+ accounts on different cloud like DO, Vultr, Linode, AWS, Upcloud, Hostwinds etc and use the open source scripts on your servers then you can migrate anytime and the code is clearly on GitHub for security.
Always use open source when that is available 🙂