Apache is a free and open-source cross-platform web server software.
Phusion Passenger is a free web server and application server with support for Ruby, Python and Node.js.
Prototype is a JavaScript Framework that aims to ease development of web applications.
RackCache is a quick drop-in component to enable HTTP caching for Rack-based applications.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.