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Kiwi for Gmail

Freemium
This is the software that Google should have developed itself.
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Mia for Gmail

Freemium
Mia for Gmail is powerful email client and notifier for Mac OSX. It stands on your Mac's menu bar.
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Unibox

Paid
Unibox is an application that aims to completely overhaul your email experience. Unibox resorts your email so that you can group the messages you receive by their sender. This unique feature
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