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17track.net
17TRACK is the most powerful and inclusive package tracking platform. It enables to track over 170+ postal carriers for registered mail, parcel, EMS and multiple express...
1,507 
$ 5,861,160.00
parcelmonitor.com
Parcel Monitor provides global parcel tracking for all carriers in 30+ languages. Use a single track and trace website for all your parcel tracking needs.
18,103 $ 741,600.00
readnotify.com
Users get free return email notifications, and/or SMS/ICQ instant messages when email they've sent gets opened, and can track their emails reading history
287,922 $ 28,620.00