The Linux command screen deserves to be more popular than it is currently. Here is a brief tutorial

Monitorix is an open source system monitoring software. You can view system health and performance metrics on a web interface that it provides. Here are the steps to install and configure it.

Munin is an open source alternate for monitoring your application servers

A simple but effective source code management and branching strategy for web development projects

Free up disk space by removing old kernels