I stumbled upon interesting article on Webdesigner Depot on new and interesting sites and tools by Cameron Chapman:
What’s new for designers, January 2013
For me the most interesting ones are:
- http://apiary.io/ - for easy documentation about REST API's
- http://www.vagrantup.com/ - for managing virtual environments
- http://prose.io/about.html - easy editing of Github Jekyll sites.
- http://extensionizr.com/ - fast start with Chrome extensions.
I encourage you to visit original post because it is much longer :)