Visual Idiot:

Brits, take control of the web. Spiffing allows you to write your CSS and stylesheets in conformance to proper British English (also known as correct English) grammar and spelling regulations.

Another fun project by Visual Idiot. Make sure to read the source code comments.
I never thought about how the language differences might affect our fellow web developers from England.

Bryan Jones:

CodeKit helps you build websites faster and better.

CodeKit finally left the beta and I just bought my license. It really is THE app if you are using LESS, SASS, Coffeescript or anything like that. I love it.
Sadly it’s not available in the Mac App Store and only purchasable by credit card.
I also like his approach for pricing CodeKit. Have a look yourself and decide how much it is worth to you.