Copydue - Top writers, on-demand for as low as $150/mo
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.
ContentFly - Simple and reliable content ordering platform for busy marketers. Only pre-vetted writers from USA & Canada and 14-day money-back guarantee.
Gmelius - Gmelius is the first collaboration platform designed for G Suite and your company's daily tools.
Boomerang Respondable - Write perfect emails with Artificial Intelligence
Boomerang for Outlook - Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.