Server Fault is a Q&A platform for system and network administrators.

Linux.com is the primary resource for open source professionals, offering news, tutorials, and career information on Linux and open source technology.

HowtoForge is a Linux tutorial and guide platform for system administrators and developers.

ManKier provides an extensive and up-to-date collection of beautifully formatted Linux man pages for various commands and system administration topics.

IT-Administrator is a magazine for IT professionals, providing news, articles, and resources on system and network administration.

SysTutorials is a technical blog providing in-depth tutorials and guides on Linux, systems administration, programming, software, and blockchain topics for IT professionals and developers.

Ubuntu Handbook provides news, tutorials, and how-to guides focused on Ubuntu Linux, covering software releases, system administration, and desktop environment tips.

FOG Project is a free open-source network computer cloning and management solution for IT professionals and is used by system administrators.

Tutos-Informatique provides in-depth guides and tutorials for Windows (10, 11, Server) and Linux system administration, network infrastructure, and IT news.

Cisco Certified Expert provides in-depth technical knowledge and guides on Cisco networking, system administration, and security for IT professionals.

Aron Schueler is a software engineer's personal website and blog about web development, devops, and system administration.

Active Directory Pro is a toolkit for Active Directory management and reporting used by IT professionals and system administrators

Országos Bírósági Hivatal is a legal system administration entity that manages court system operations.

ivarch.com is the best resource for free software development and is used by software developers and Unix system administrators.

M/Monit is a monitoring and management tool for distributed computer systems used by IT professionals.

Ammyy Admin is the best remote desktop software for remote access and is used by over 80 million personal and corporate users.

R-fx Networks is the best open source software for Linux system administration and is used by system administrators worldwide.

UNIX and Linux System Administration Handbook is the best resource for system administrators and is used by IT professionals worldwide.