Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
Lead Forensics - B2B website analytics and lead generation.
Recurrr - Send recurring emails
FindThatLead Prospector - Feed your sales team with daily leads.
FollowUpThen - The simplest way to schedule an email reminder