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FreePBX is a first-class replacement for commercial phone systems, even in complex setups.

The Kopia open source system for automating the creation and transfer of backups supports a wide range of remote storage devices, making it particularly useful as a backup tool in cloud environments. The convenient GUI for Windows installations holds its own against commercial products, despite its short development history.

We take a deep dive into two powerful tools for tracing network paths and troubleshooting connectivity issues: Test-NetConnection and mtr.

Sensor tools can provide highly variable data from CPUs, GPUs, and a variety of sources. We look at some tools to verify the temperature of components on diverse hardware.

Defining I/O baselines helps you determine the highest performance you can expect from your system when configured properly.

Maximize telephony uptime by clustering Asterisk or FreeSWITCH PBXs together.

Optimize your code with loop transformations.

The free Alerta fields alerts from several monitoring systems and delivers them in a web GUI or at the command line.

DRBD9 and DRBD Reactor create a Linux high-availability stack for virtual instances with replicated storage comparable to the classic Corosync and Pacemaker solution.