OMI – the Open Source CIM server is available on github
https://github.com/Microsoft/omi
This appears to be a later version than currently shown on the open group web site
Combine this with open source PowerShell
https://github.com/PowerShell/PowerShell
and the DSC on Linux
https://github.com/Microsoft/PowerShell-DSC-for-Linux
And you have your basis for managing Linux machines