A list of WordPress Theme Development kits that need a web developer to develop a new or existing wordpress theme:
WebMatrix is free web development tools from Microsoft Corporation and helps you to install and configure more than 76 free open source software including WordPress, Joomla, PHPBB and many more in Local Computer.
To get master on WordPress and develop a well-organized, beautiful and error free WordPress Theme, you must check codex.wordpress.org and follow their guidelines.
Sprite Cow is online based tools and helps you to get exact dimension of a .png image from sprite images.
Pixie is html color code picker and a very light weight less than 15kb portable tool. This tool brought you by Nattyware for free to use.
It is an online based free tool to generate favicon for your website. It supports to generate favicon for 64×64, 32×32, 24×24 and 16×16 dimension.
- Adobe / GIMP
Images are part & parcel of website development process. To optimize images for websites, you can use Adobe product (Not free) or GIMP (Free).
It is a free service from Google Corporation to optimize any website for better performance on all devices including mobile and computer.