Open-source, self-hosted polling tool to find the best date/time with no login required.

5.2k stars552 forksAGPL-3.0last commit Actively maintained
Rallly is a web-based group scheduling and polling tool for finding meeting times. Users propose date/time options or event choices, collect votes/RSVPs via shareable links, and optionally send reminders; no login required.
Open-source, self-hosted polling tool to find the best date/time with no login required.

5.2k stars552 forksAGPL-3.0last commit Actively maintained
Django-based application to create date/time polls and general surveys for scheduling meetings, with anonymous voting, private events, and LDAP support.
312 stars41 forksGPL-3.0last commit Actively maintained
Free/libre web service for creating date-based scheduling polls and classic option polls; no registration required. Operated by Framasoft and built on the Pollaris open-source project.
Activity unknown
A lightweight, curl-first free/busy scheduler that syncs availability from a CalDAV calendar and can send iCal booking invites via SMTP.

Activity unknown
Every option on this page is open source and free to run on your own hardware, so you own the data and there is no subscription to cancel. 2 of 4 shipped a commit in the last six months. Licences in this list: AGPL-3.0, GPL-3.0. In exchange you take on hosting, backups and updates yourself.
Browse everything in Scheduling, Booking & Appointments.