Special hardware?

Penfriend

Windows
Penfriend is an assistive typing tool that helps you type by trying to predict the word you’re writing based on the letters and words

SMART™ Digital Whiteboards

The SMART™ Notebook is available in Gaelic, as in, a language pack that will provide you with the interface for the digital whiteboards produced

No, not really

Easy one. Anything you might want to do in relation to Scottish Gaelic you can achieve with the normal out-of-the-box hardware you got when