The best open source alternative to Microsoft Endpoint Configuration Manager is Rudder. It's not free, so if you're looking for a free alternative, you could try WSUS Offline Update or opsi.org. If that doesn't suit you, our users have ranked more than 10 alternatives to Microsoft Endpoint Configuration Manager and six of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Microsoft Endpoint Configuration Manager are Wsus Package Publisher, Wapt (enterprise) and m23.
Rudder is a solution for automating your IT infrastructure to ensure security, reliability and compliance of your systems, whatever the OS. Gain instant visibility of IT compliance and benefit from continuous remediation to ensure an environment well configured and secured.
Using "WSUS Offline Update" (formerly known as "ct offline update" or "DIY Service Pack"), you can update any computer running Microsoft Windows safely, quickly and without an Internet connection.
Indeed discontinued but its development is maintained by the fork WSUS Offline Update Community Edition (https://gitlab.com/wsusoffline/wsusoffline/-/releases) Pro: Good alternative for offline Windows updates. Con: Does not offer Windows upgrades ; i.e., you cannot upgrade from for example 20H2 to 21H2.
opsi is an Client Management System for Windows and Linux clients based on Linux servers.
Publish third-party applications into your Wsus. Wsus Package Publisher allows you to publish your own updates as MSI, MSP or EXE files. You can import updates from vendor catalogs to publish software & hardware updates.
The enterprise version of wapt makes it possible to manage the update of a windows park in the manner of a wsus. The enterprise version of wapt has the same functionality as the community version but with additional features.
m23 is a software distribution and management system for the Debian, Ubuntu, Kubuntu Linux, Xubuntu, Linux Mint, elementary OS, Fedora, CentOS and openSUSE distributions.
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WSUS Offline Update is for updating Windows computers, not managing them or their configuration