DDM (Don't Disturb Me) is an application which allows you to turn of the ringer of your Android phone for particular incoming numbers and (if you want) in particular days and/or times.

Unit converter, Currency converter and Tip calculator. This utility comes with more than 1500 units across more than 65 categories. Pretty nice and convenient user interface allows to convert many tedious conversions. Multilingual application. Supports 13 languages.