Friendbar makes it easy to keep in touch with friends on Facebook and Twitter. It displays a running stream of text and photo updates from Facebook and Twitter right on the toolbar, and allows you to post updates and reply from the toolbar itself.
Note
Firefox 3.0 and 3.0.* Windows 2000/2003/XP/Vista

Comodo SecureEmail automatically secures your email messages by encrypting and digitally signing them using email certificates so that they cannot be intercepted, read or altered on its way through the Internet. The confidential information from the sender is protected from being stolen and the recipient is assured that the message is from the authentic sender.

Bitter a social networking tool that allows you to post to and get messages from Twitter, Plurk, and Friend Feed.
Note
.NET Framework 2.0 or higher.

AlertThingy v3 brings the very latest updates from your favourite social networks direct to your desktop. Plus send Tweets, update your Facebook status, upload photos to Flickr, post to Tumblr and more. With v3 AlertThingy makes it faster and easier to manage the online you. Plus you get the coolest looking RSS reader on the interweb.
Note
Windows 2000/2003/XP/Vista. Adobe(R) AIR(R) < http://get.adobe.com/air/ > required. Twitter account required.

Basic features: – free license – works under Windows XP/Vista, both 32/64 bits versions – support for ICQ, Yahoo, Skype, AIM, MSN, Gadu-gadu, Tlen, Jabber and LAN talks (can chat in local network) – built-in installer to get new plugins, games and more – multiple chats in one window – files and images transfers – basic picture editing – built-in games (Ships, Go and Checkers) and more from installer – available in many languages – easy to use userlist – conferences support – profiles for users on local PC – autoupdate system – skin and new emoticons support – SDK for programmers – connected with Evermotion forum

Available games: – Bejeweled Full Version – Marbles Full Version – Doomsday Demo