Dudle - Dudle is an online scheduling application, which is free and open source.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
Geekbot - Discover how to organise asynchronous stand up meetings in Slack and keep your team synced using Geekbot. Start your free trial today!
Framadate - Make your polls
Chili Piper - Chili Piper is an intelligent calendar for Sales teams, to book their own meetings or set appointments for other teams.