The Tools Menu

Tools->Spelling...

Check spelling of words in the worksheet.

Tools->Custom Lists...

View or amend the special series of words recognized by KSpread.

Tools->Recalculate Sheet (Shift+F9)

Recalculate formulae in the current sheet.

Tools->Recalculate Workbook (F9)

Recalculate all sheets.

Tools->Calculator

Open an instance of the desktop calculator KCalc.