searching for a gnu/linux based SUS replacement

Dear Ladies and Gentleman

After searching for a while online, and looking up possible methodes of a 
secure patching environment i thought on asking around at this place, if 
anyone of you maybe know a replacement for the SUS system that M$ is 
offering, which id be able to apply on a gnu/linux server, so i could set 
scheduled patching of microsoft machines from a gnu/linux box.

Id be thankful for every tip or maybe pointing me into the right direction to 
look.

Thanks for reading and greetings

Oliver Leitner.

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