Wobaka - Refreshingly Simple CRM And Email Automation
Followup.cc - FollowUp for email is a lightweight productivity suite that keeps your conversations and tasks from slipping through the cracks. Set perfectly timed reminders that arrive at the top of your inbox, right when you need them.
InStream CRM - Business relationship management platform - CRM alternative
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Streak - Manage customers inside Gmail
Streak for Mobile - The CRM for Gmail