The best open source alternative to Cloudron is YunoHost, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Cloudron and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Cloudron are Webmin (Free, Open Source), Sandstorm.io (Free, Open Source), Cozy (Freemium, Open Source) and BitNami Application Stacks (Free, Open Source).
NethServer is a CentOS-based Linux distribution for servers. The product's main feature is a modular design which makes it simple to turn the distribution into a mail server and filter, web server, groupware, firewall, web filter, IPS/IDS or VPN server.
ClearOS is a family of operating systems for the enterprise, small business, and home. There are three editions to choose from depending on your needs and suitable to your abilities. They are: ClearOS Enterprise, ClearOS Home, and ClearOS Core.
Save time and money with 100+ ready-to-use solutions that include a Debian based OS, and the relevant open source software and all dependencies pre-installed. Discover and leverage the best free open source software.
Libre.sh is a little framework to host Docker. It is simple and modular and respect the convention over configuration paradigm. This is aimed at Hosters to manage a huge amount of different web application, and a quantity of domain names related with emails and so on.