At the moment, SkyDrive is the only office suite which is available online in Gaelic. Similar to GoogleDocs. You can buy it (if you want the full set of features) but a cut-down version is provided for free with Outlook.com (the new Hotmail). So if you have set Outlook.com to come up in Gaelic, you will already have SkyDrive in Gaelic also. That gives you an online version of Word, Excel, PowerPoint and OneNote. And 7GB of cloud storage.
If you don’t have an account yet, you can register one for free here. Once you have one (or if you already do), do the following:
Click on the chevron:
Agus an uairsin air SkyDrive:
And then SkyDrive (the fourth tile that appears)!