FullCalendar - FullCalendar is an open-source JavaScript event calendar.

Geekbot - Discover how to organise asynchronous stand up meetings in Slack and keep your team synced using Geekbot. Start your free trial today!

Dudle - Dudle is an online scheduling application, which is free and open source.

Chili Piper - Chili Piper is an intelligent calendar for Sales teams, to book their own meetings or set appointments for other teams.

Mobile-Calendar - Reservation management system. If you rent accommodation, the mobile-calendar app was made for you!

Standuply - Run daily standup meetings and track your metrics in Slack