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.
Kriya AI - Your Instant Workforce
Streak - Manage customers inside Gmail
MyTime Scheduler - The online scheduler connecting small businesses to clients
NetHunt CRM - Turn Gmail into a smart CRM
Close - A CRM with built-in calling, SMS, and email