Taskful - Deadlines, meet your match.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Gone - An ephemeral to-do list
Standuply - Run daily standup meetings and track your metrics in Slack
Calendarist - Time blocking companion for Google Calendar
MeetNotes - Increase Productivity with Meeting Notes Tool. More effective minutes, Prepare Agenda, Collaborative Notes & Action Items.