ASpell - Separate spell checker. Checks word spelling against GNU ASpell dictionary and says whether correct and suggests correct spellings. Defaults to American English unless you select British English check box.
Reading comments, it's not possible for me to embed this in other built-in applications
Pocket Solver - Pocket Solver allows you to solve equations on your Pocket PC. You type in an equation and enter values for all but one of the variables. Unlike a spreadsheet or calculator, any unknown variable can be found without having to rearrange the equation.
Pocket Solver isn't just limited to performing everyday calculations
Custom Convert - Custom Convert allows you to quickly and easily convert between quantities. Simply select the starting units from the drop down list, select the required units from the second drop down list, type in a number and the result is displayed. Custom Convert comes with 166 pre-defined conversions and 166 inverse conversions, totaling 332 in all
