Laytr - Laytr is the easiest way to defer emails.
SendRecurring - SendRecurring allows you to setup, send, and maintain scheduled email reminders.
CoinDock - Live crypto prices right in your macOS Dock
Recurrr - Send recurring emails
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.
Pebblely - Turn boring product images into beautiful marketing assets