Claims to be an easy-to-integrate self-hosted tool to monitor the performance of your Ruby on Rails application. This is a simple and free alternative to the New Relic APM, Datadog or other similar services. Realtime monitoring, throughput, average response time, which bits are the slowest, database queries, delayed_job monitoring, and custom events.

Known to work with Rails v4.2 and later. Requires Redis to hold the stats.

Amazingly, plugs right into Huginn using the default instructions.

A self-hosted web radio management suite, including turnkey installer tools for the full radio software stack and a modern, easy-to-use web app to manage your stations. Built to run on even the most affordable VPS. Media manager, playlist manager, live DJ enabled. All done through the browser. Customizable users' player page. Supports listener requests. Can relay to other servers. REST API.

Way Docker-heavy. Written in PHP.

Hydra is a platform for live coding visuals, in which each connected browser window can be used as a node of a modular and distributed video synthesizer.

A utility that works like the top utility of Unix machines, only it watches MySQL threads to tell you what they're doing and how busy they are. Useful for figuring out where your apps are bogging down.

A wiki dedicated to the art of contact juggling.

A utility written in Python that parses the output of iostat and draws charts that visualize system performance.

A Perl script that logs into a MySQL database server (with or without credentials), analyzes it, and makes suggestions to optimize its performance.

A utility that uninstalls all of the cruft from Windows that turns it into a 15 gigabyte disk hog right off the DVD.