Google' UTM builder is handy but I like the step-by-step flow, @thecoffeecoder. It's particularly useful when you don't know how to accurately tag a URL.
@druwynings all those features are included in UTM Link Manager - we'll be opening our beta program at the end of this month if you're interested. You can also attach thumbnails to you links and generate short links in one click. http://goo.gl/17XjeZ
Product Hunt
TextQuery
UTM.io
Sensible Instruct
TextQuery