Top 10 Unofficial Gmail Applications

 10. Drag and drop attachment upload (Firefox)

 9. GmailThis! bookmarklet (all browsers)

 8. Import old email with Gmail Loader (Windows/Linux)

 7. Check multiple accounts with Gmail Manager (Firefox)

 6. Gmail Encryption (Firefox)

 5. Gmail Skins (Firefox extension)

 4. Saved Searches (Firefox)

 3. Gmail Macros (Firefox)

 2. Conversation Preview (Firefox)

 1. GmailDrive file manager (Mac/Windows/Firefox)

source : Lifehacker

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