Petri:

https://www.petri.com

The Petri IT Knowledgebase has served as one of the world’s leading content and community resources for IT professionals and system administrators for more than 15 years. First launched by IT expert Daniel Petri in 1999, the Petri IT Knowledgebase has always been focused on serving the needs of IT professionals by providing information to help them solve problems, do their jobs more effectively, and to advance their careers.

Thurrot:

https://www.thurrott.com/

News, Reviews and Analysis for Tech Enthusiasts.

IT Unity:

https://www.itunity.com

IT Unity is the incredible new site that empowers individuals and organizations to solve business problems with technology. IT Unity is a community of trusted experts, users, business decision makers, IT professionals, developers, and industry solution providers—everyone who works with Microsoft SharePoint and Office 365 (with more technologies to come!).