FireGPG is a Firefox extension under GPL which brings an interface to encrypt, decrypt, sign or verify the signature of text in any web page using GnuPG.
download mail from the most famous webmails, but it could also be used as an aggregator for RSS feeds and much more. This way it is possible to get all your messages in your favorite email client. FreePOPs is Free Software!
Unfortunately, there are no leaked screenshots to look at yet, but if you are one of the lucky few testers, I would love to take a peek. How do I know they are working on a “New Version”