Frink - Frink is a programming language and calculating tool designed to help you make real-world calculations.
Frink is different than other calculating tools in that it tracks units of measure through all calculations. Thus, you can add feet and meters, multiply by grams, divide by pounds, and Frink does the right thing through all calculations
Abiro Unit Converter - Abiro Unit Converter enables you to quickly and easily convert between popular units and number bases. It's useful on trips, when faced with foreign units that you can't quickly convert in your head. The number base conversion is very useful when developing software, or if you just feel generally geeky.
Usage
* Enter a value in Value
ELC (Expandable Linear Converter) - ELC (Expandable Linear Converter) has several installed measure units and divided in categories. It can convert value between them. It is possible to add new categories and new measure units.
It starts showing the list of basic conversion fields, it is possible to add other fields and conversion units
Handy Converter for Mobile phone - your all-in-one currency and unit conversion solution. No matter what you need to convert into, this easy-to-use tool has the accurate answer
Measurement Units Convertor - Please note that this application has been now moved the 3B Software Ltd servers: http://3bsoft.net It has only occured to me recently that the Sony Ericsson 750i does not seem to include a weight/distance/volume convertor utility. Nokia had such an utility on their phones for a while now -- even though it looked a bit, well, rubbish really :-)