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SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Immediately - Mobile sales email and CRM management for Gmail & Salesforce
Recurrr - Send recurring emails
NetHunt CRM - Turn Gmail into a smart CRM
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.
FollowUpThen - The simplest way to schedule an email reminder