fournova Software
Powerful Git client for Mac and Windows developers
Delicious Brains ★
Powerful plugin framework for adding custom fields to WordPress
John Blackbourn
Developer debugging panel for WordPress – debug queries and performance
WP-CLI Team ★
Command-line interface for WordPress – manage installations without a browser
WP Engine
Create local WordPress development environments with just a few clicks
WordPress Foundation ★
Essential development tools and resources for WordPress developers and designers