Umbrel is described as 'A beautiful personal server OS for self-hosting for any Linux distro' and is a Linux Distro in the system & hardware category. There are more than 50 alternatives to Umbrel for a variety of platforms, including Linux, Self-Hosted, Web-based, Windows and Mac apps. The best Umbrel alternative is Debian, which is both free and Open Source. Other great apps like Umbrel are YunoHost, Pop!_OS, macOS and ReactOS.
Sandstorm makes it easy to run your own server. Install apps to create documents, spreadsheets, blogs, Git repos, task lists & more as easily as you'd install apps on your phone.
Rocky Linux is a community enterprise operating system designed to be 100% bug-for-bug compatible with America's top enterprise Linux distribution now that its downstream partner has shifted direction. It is under intensive development by the community.
Vanilla OS is an operating system built with simplicity in mind. It's fast, lightweight, beautiful and ready for all your daily tasks.
Cloudron is a complete solution for managing apps & users on your own server. Easily deploy production ready apps from the app library and keep them automatically up-to-date. It even comes with a built-in email server and web clients!.
Open source, self-hosted suite featuring mail, calendar, drive, and contacts. Provides privacy without analytics or ads, file versioning, sharing, recurring calendar events, and compatibility with open standards, keeping control and portability with the user.
Void is a general purpose operating system, based on the monolithic Linux kernel. Its package system allows you to quickly install, update and remove software; software is provided in binary packages or can be built directly from sources with the help of the XBPS source packages...
BitNami Stacks make it incredibly easy to deploy your favorite open source software. BitNami Stacks include an open source application and all of the other software necessary to run it, such as Apache, MySQL, PHP or Ruby.
The OpenMandriva distribution is a full-featured Linux desktop and server, sponsored by the OpenMandriva Association, and is based on ROSA, a Russian Linux distribution project which forked Mandriva Linux in 2012.
Storj Object Storage is a distributed cloud object storage which is fully Amazon S3-compatible, globally distributed and encrypted.
CapRover is an extremely easy to use app/database deployment & web server manager, PaaS, for your NodeJS, Python, PHP, ASP.NET, Ruby, MySQL, MongoDB, Postgres, WordPress (and etc...) applications!
Nirvati is an open-source server management designed to make self-hosting easier. It is built on Kubernetes and contains an integrated VPN feature, as well as HTTPS for all apps.
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This, CapRover, is not an OS. Umbrel is a server OS. Even if it's argued that Umbrel is mostly the software running on the OS, it is used to manage one-click install Docker containers. It is more intended for easy server hosting, and isn't for getting deep into managing things like database and web servers.