another one gdrive

allows to "mount" several "gmail drives"

A typical URL contains – optionally – an avatar image or photo, name, location, bio, links* and more. If you’re logged in, you can find your own profile at google.com/s2/profiles/me.

iContact is a free software tool for Windows that allows you to access your GMail address book from your desktop. You can find your contacts very quickly without the need to login to your GMail/Google Apps account everytime.

Mail Trends lets you analyze and visualize your email (as extracted from an IMAP server).

"CookieSwap enables you to easily swap all your cookies so that you can be logged in to multiple web e-mail accounts (like Gmail and Yahoo! mail) at the same time and quickly switch between them." finally !!