Upcall - Upcall enables you to crowdsource your outbound calls. Collaborate with 1000+ on-demand callers worldwide for sales, marketing and customer support calls. Free trial.
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Veloxy - A sales enablement app. Your calendar on steroids!
Recurrr - Send recurring emails
Kit CRM - A CRM for your Facebook page
FollowUpThen - The simplest way to schedule an email reminder