FastTip allows you to quickly calculate the tip you award your restaurant servers. It has good support for non-USD currencies. It also has an easy to use satisfaction rating scale to help you calculate your tip in accordance to the quality of service. On top of it all is a great and clean looking interface.
What's New in Version 1.1
Adds integration with my new app InstaSplit to allow you to instantly split the bill after calculating your tip.
Adds the ability to change the default tip levels in the Settings apps.