impress.js : It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com
Photon : UI toolkit for building desktop apps with Electron.
Cliquet : Cliquet is a toolkit to ease the implementation of HTTP microservices, such as data-driven REST APIs.
Bespoke.js : Bespoke.js is a super minimal, modular presentation library for modern browsers, designed to foster a rich plugin ecosystem.
pyo : pyo is a Python module written in C to help digital signal processing script creation.
In few words, Given a html document, it pulls out the main body text and cleans it up. It also can clean up title based on latest readability.js code.