Escape Velocity Nova Fix for Modern OS X

Autoload classes, functions, enums, constants, and typedefs on HHVM

A Hack library for writing unit tests expressively

The Hack Standard Library

The official Hack Language specification.

The sources for how we have built the HHVM packages.

The Hack and HHVM manual and documentation

Syntax highlighting and typechecker integration for Hack.

Provides classes to use with XHP for common components of Twitter's Bootstrap library.

A virtual machine for executing programs written in Hack.

Class libraries for XHP. XHP is a Hack feature that augments the syntax of the language such that XML document fragments become valid Hack expressions.

A complete app.net library written in JavaScript. Exported as a jQuery plugin.