Apache is a free and open-source cross-platform web server software.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Paper.js is an open-source, vector graphics scripting framework, which offers a powerful Scene Graph and extensive functionality to create and manipulate graphic items using layers, gradients, blending, and other advanced features
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.