There is a growing number of projects using GitHub as their source code repository. Below are some WordPress-related projects that we recommend you “watch”.
Developer Tools
WPAlchemy
WPAlchemy can be used to create WordPress meta boxes quickly. It will give you the flexibility you need as a developer, allowing you to quickly build custom meta boxes for your themes and plugins.
Custom Metaboxes and Fields for WordPress
Custom Metaboxes and Fields lets you easily create metaboxes with custom fields within either your themes or plugins. Read the documentation.
WordPress Widget Boilerplate
Similar to the plugin boilerplate by the same author. An organized, maintainable boilerplate for building WordPress widgets.
WordPress Creation Kit
Add advanced custom fields, in the form of repeater fields within a metabox, to any custom post type. Read more about it (half-way down page).
TGM Plugin Activation
TGM Plugin Activation is a PHP library that allows you to easily require or recommend plugins for your WordPress themes (and plugins). It allows your users to install and even automatically activate plugins in singular or bulk fashion using native WordPress classes, functions and interfaces.
WordPress Github Plugin Updater
This class is meant to be used with your Github hosted WordPress plugins. The purpose of the class is to allow your WordPress plugin to be updated whenever you push out a new version of your plugin; similarly to the experience users know and love with the WordPress.org plugin repository. Not all plugins can or should be hosted on the WordPress.org plugin repository, or you may chose to host it on github only.
WordPress
WordPress, Git-ified. Synced via SVN every 30 minutes, including branches and tags!
Plugins
WooCommerce
An open source eCommerce plugin for WordPress created by WooThemes.
Posts 2 Posts
Efficient many-to-many connections between posts, pages, custom post types, users. Read more on Scibu.net.
WordPress Post Formats Admin UI
The plugin is a completely additive solution that leverages the default WordPress functionality, while improving the UI and standardizing the names and presentation of custom fields that support the various post formats. See screenshots of the plugin in action in Alex’s blog post.
WPThumb
An on-demand image generation replacement for WordPress’ image resizing. WP Thumb is a simple plugin that makes use of the PHPThumb library. It seamlessly intergrates with the WordPress image functions. You can specify height, width and crop values, and an image will be generated, which is then cached for future use.
WP e-Commerce
WP e-Commerce is the free WordPress shopping cart plugin from getshopped.org that lets customers buy your products, services and digital downloads online.
Options Framework Plugin
The Options Framework Plugin makes it easy to include a full featured options panel in any WordPress theme.
Infinite Scroll
jQuery and WordPress plugins for Infinite scroll, which allows your blog to pre-fetch content from a subsequent page and adds it directly to the currently displayed page. No more paging!
Themes
Underscores
Automattic’s new starter theme for rapid theme development. Underscores gives you a 1000 hour head start.
Skeleton
Skeleton is a simple, responsive WordPress theme based on the Skeleton Boilerplate. It has several useful shortcodes, such as tabs, toggles, cross-browser CSS3 buttons, and layout columns. It also includes a bbPress skin/stylesheet and sample child theme.
Reverie
Reverie is a versatile HTML5 responsive WordPress framework based on ZURB’s Foundation.
Foundation
Foundation for WordPress, a Responsive Starter Theme. Again using ZURB’s rapid development framework : Foundation.
Roots
Roots is a starting WordPress theme made for developers based on HTML5 Boilerplate & Bootstrap from Twitter.
Options Framework Theme
The Options Framework Theme has all the code included to build a full featured options panel. It’s basically a bundled version of the Options Framework Plugin for those folks who want to build the options directly into the theme (rather than relying on a plugin).
StartBox
An incredibly powerful theme framework for WordPress from wpstartbox.com.
What Next?
Um… go and read some source code! You can also search Github for all WordPress related projects - there are 256 pages worth!