Convert Me is a simple and easy to use Android app providing a fast and simple way of converting between many different units of measure.

IP Monitor is a free, simple and easy to use application that allows you to perform a particular action when your Internet IP address changes.

This enables you to automate tasks such as updating dynamic DNS records (using scripts and clients such as ddclient).
IP Monitor can be configured to send email alerts when a change in IP is detected and notify you of important events.