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Raportive

Rapportive shows you everything about your contacts right inside your inbox.
Gmail Addons
Smart Devices: TVs, Phones, Tablets and Others

Boomerang for Gmail

Add scheduling to your emails. Boomerang makes it easy to schedule your emails to be sent at specific times like the start of the workday. This can be particularly useful if you’re communicating with people in different time zones. You can also send follow-up reminders to yourself, archive messages and return important emails to the top of your inbox when you know you will have time to read them.

Gmail Offline

Freeware

Gmail Offline lets you work with Gmail ... when you're offline. No Internet connection? Who cares? You can read, respond, even search your messages. You just won't get or send any new mail until you reconnect.

Checker Plus for Gmail

Freeware

The best extension for users of multiple Gmail accounts is Checker Plus. It gives you fast access via a drop down menu in Chrome, desktop notifications, color coding, even voice input for writing messages. Users of the Awesome New Tab Page app get full integration. A donation of any amount unlocks even more features.