1. Facebook Toolbar - A very popular Firefox add-on that tightly integrates your Facebook account with your web browser. You can do search, upload and download photos, messages directly from this toolbar.
2. FriendMobilizer - This excellent application provides access to Facebook from wide range of smartphones and PDA’s.
3. Facebook Desktop Client - A handy desktop application keeps you connected with Facebook and provides all updates, alerts right on your desktop.
4. LiveUpload - An excellent plugin for Windows that integrates with Windows Live Gallery facilitating direct uploads of photographs from Windows Live Gallery Beta to your Facebook account.
5. OutSync - A unique application that updates and syncs your Microsoft Outlook contacts photographs with that in your Facebook account.
6. WordPress Fotobook - Want to keep all your Facebook photo albums on a single WordPress page? Then use this handy WordPress plugin to seamlessly import all your albums in your Facebook account.
7. Friendbar - A Facebook toolbar for Microsoft Internet Explorer. You can update your status, send scraps, share videos and web pages and can get alerts through this toolbar.
8. Wordbook - This WordPress plugin integrates your Facebook account with your WordPress blog and vice-versa.
9. Netvibes Widget - One of the popular widgets that lets you see your Facebook profile and friends from your personalized Netvibes home page.
10. Google Notifications Gadget - Integrates Facebook alerts into your Google Desktop application. Supports fluid resizing sidebar with internationalization support.