Fat-Free vs io.js: What are the differences?

Developers describe Fat-Free as "PHP micro-framework designed to help you build dynamic and robust Web applications - fast". Fat-Free Framework makes it easy to build entire Web sites in a jiffy. With the same power and brevity as modern Javascript toolkits and libraries, F3 helps you write better-looking and more reliable PHP programs. On the other hand, io.js is detailed as "A friendly fork of Node.js with an open governance model". io.js is a JavaScript platform built on Chrome's V8 runtime. This project began as a fork of Joyent's Node.js and is compatible with the npm ecosystem.

Fat-Free and io.js can be primarily classified as "Frameworks (Full Stack)" tools.

"Open source" is the primary reason why developers consider Fat-Free over the competitors, whereas "Compatible with NPM" was stated as the key factor in picking io.js.

Fat-Free is an open source tool with 2.3K GitHub stars and 443 GitHub forks. Here's a link to Fat-Free's open source repository on GitHub.