since 1983, developing the free unix style operating system gnu, so that computer users can have the freedom to share and improve the software they use.

q&a for ubuntu users and developers

ubuntu is the modern, open source operating system on linux for the enterprise server, desktop, cloud, and iot.

the linux documentation project is working towards developing free, high quality documentation for the linux operating system. the overall goal of the ldp is to collaborate in all of the issues of linux documentation.

a computer science portal for geeks. it contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview questions.

stack overflow is the largest, most trusted online community for developers to learn, share​ ​their programming ​knowledge, and build their careers.

in-depth, to-the-point tutorials on java, spring, spring boot, security, and rest.