Hello there,
As far as my research, you may try Ansible.
Red Hat's open source approach was a factor when choosing Ansible, since the solution is free as of right now.
In addition, try using key words like "Configuration Management""SCCM Alternatives""Microsoft Endpoint Management Alternatives" to search.
This forum is for technical questions and answers about Microsoft and its product, you might not efficiently find alternatives here.
Tech platforms that make comparisons between tools will help:
https://sourceforge.net/software/product/Microsoft-Endpoint-Manager/alternatives
https://www.itcentralstation.com/categories/configuration-management
Please note: The mentioned product& websites are owned and operated by a third party. Microsoft has no control regarding to the product's performance and reliability.
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Best Regards,
Samson Peng