From how to French brain or play the guitar to how to unclog a sing or perform CPR, you can learn all kinds of useful skills on YouTube. We at Mental Floss are always eager to learn new things and ...

Learn Linux Kernel internals using Linux Kernel Explorer, a free website that helps you explore the Linux kernel in a structured way.

OSTechNix (Open Source, Technology, Nix*) regularly publishes the latest news, how-to articles, tutorials and tips & tricks about free and opensource software and technology.

Mac app that shows all open files, directories, sockets, pipes and devices in use by all running processes. Nice GUI for lsof.