When a developer starts WordPress development and tries to make the process easier and faster, generally he searches for best tools and various boiler plates which can alleviate the manual task of starting the development from scratch.
WordPress Gear (WPgear.org) is a website which lists out lots of useful tools those are free and GPL(OpenSource). The list includes tools and its related information for all aspects of WordPress development. Starting from WordPress base tools to Debug tools, PHP boiler plates, Meta fields frameworks, Theme development tools and lot more..
New and latest tools are being added constantly into this list as this is a community driven site. Whole of the code for this page resides in Github and anybody can add any free tool into the list. Just fork the project, add/edit your tool with a link, submit a pull request.