TypeCatcher allows you to search, browse, and download Google webfonts for off-line use on the Linux desktop. You can preview fonts with adjustable size and text.
On Ubuntu or Debian, it may be installed from the default repositories with:
sudo apt-get install typecatcher
The most recent release is also available in a PPA:
sudo add-apt-repository ppa:andrewsomething/typecatcher
sudo apt-get update && sudo apt-get install
Pull requests and bug reports are welcome here. If Bazaar is more your style, this began on Launchpad and is still mirrored there. It can be translated there as well.
TypeCatcher is licensed under the GPL 3.0.