Back in 2013, I talked about using Google Fonts in the article Hosted Custom Fonts. Have a read of that article to get information about using Google Fonts. There are some very good fonts available. However, the default implementation of Google Fonts is to import the fonts from the Google CDN. That's fine when you are working on a web page where you can implement a style sheet, but what about if you want to use the fonts in a Word document or in your email client?
Now you can download Google Fonts for use on your local machine. The Google team have now made all fonts available via SkyFonts which means you can download the font file.