SpellingCity, you guessed it, offers spelling practice.

The SpellingCity software recently won the honour of being "SMART Board Ready" as they've redesigned all of their activities to work by touching or dragging objects. Their games will also be revised so that they can be displayed in full-screen!
Next to online spelling test, there is TeachMe. It spells and displays the word in ways that stimulate memory for visual and verbal learners. And all sorts of other activities such as WordSearchhat, UnScramble, WhichWord?, Sentence UnScramble and MissingLetter.

Source:  Teachers Love Smartboards