1.2kActiveIn your browserAGPL-3.0Runs on your own server
A calendar app that runs on a Nextcloud server, letting you sync events from your devices and edit them in a web browser. It is for people and teams who want to keep their calendar on their own Nextcloud server.
Runs on your own server · GitHub · Needs a Nextcloud server
49kActiveMITReplaces partlyRuns on your own server
Cal.diy is the free community edition of Cal.com, which lets you share a page where others pick a meeting time. It is for people running their own server, and the makers advise it for personal use only.
Runs on your own server · GitHub · Booking pages only; you host it, no calendar app
Etar is a calendar app for Android phones that shows month, week, day and agenda views. It is for people who want a simple calendar that can keep events on the phone or sync them with a calendar server.
Fossify Calendar is a calendar app for Android phones that lets you plan events, reminders and repeating appointments. It is aimed at people who want a private calendar with no ads or tracking.
285ActiveAGPL-3.0Replaces partlyRuns on your own server
Polls is an add-on for Nextcloud, a self-hosted file and collaboration server, that lets you create polls to find a meeting time or pick options. It is for people and teams who run their own Nextcloud and want to schedule without Doodle.
Runs on your own server · GitHub · Only for picking a date together, like Doodle
243ActiveAGPL-3.0Replaces partlyRuns on your own server
Tymeslot is scheduling software that lets people share their availability and let guests book meeting times. It is meant for individuals and teams who want to run their own booking system on their own server.
Runs on your own server · GitHub · Booking pages only; you host it; young project
Not on GitHubActiveWindows · Mac · Linux · AndroidVerifiedMPL-2.0Replaces partlyApp
Thunderbird is a free, open-source email app for Windows, macOS and Linux that also includes calendars and contacts, with an Android app for email. It suits people who want to manage their email and calendars in one desktop program without relying on a big tech company.
App · Own website · Desktop only; no phone calendar app
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Before you build
Planning something for an alternative to Calendly? See what exists first, so you can reuse parts or explain what's different. Paste this into any AI assistant:
Read the list of open-source alternatives at https://opensourceeverything.org/data/groups/scheduling.json. Compare it with my project or idea below. Tell me which projects overlap, what I could reuse instead of rewriting, and what mine does that none of them do.
My project or idea:
Here is a list of open-source alternatives to Calendly, from Open Source Everything (CC BY-SA 4.0):
- Nextcloud Calendar (AGPL-3.0, https://github.com/nextcloud/calendar; replaces fully): A calendar app that runs on a Nextcloud server, letting you sync events from your devices and edit them in a web browser. It is for people and teams who want to keep their calendar on their own Nextcloud server.
- Cal.com (MIT, https://github.com/calcom/cal.com; replaces partly): Cal.diy is the free community edition of Cal.com, which lets you share a page where others pick a meeting time. It is for people running their own server, and the makers advise it for personal use only.
- Etar Calendar (GPL-3.0, https://github.com/Etar-Group/Etar-Calendar; replaces partly): Etar is a calendar app for Android phones that shows month, week, day and agenda views. It is for people who want a simple calendar that can keep events on the phone or sync them with a calendar server.
- Fossify Calendar (GPL-3.0, https://github.com/FossifyOrg/Calendar; replaces partly): Fossify Calendar is a calendar app for Android phones that lets you plan events, reminders and repeating appointments. It is aimed at people who want a private calendar with no ads or tracking.
- Nextcloud Polls (AGPL-3.0, https://github.com/nextcloud/polls; replaces partly): Polls is an add-on for Nextcloud, a self-hosted file and collaboration server, that lets you create polls to find a meeting time or pick options. It is for people and teams who run their own Nextcloud and want to schedule without Doodle.
- Tymeslot (AGPL-3.0, https://github.com/Tymeslot/tymeslot; replaces partly): Tymeslot is scheduling software that lets people share their availability and let guests book meeting times. It is meant for individuals and teams who want to run their own booking system on their own server.
- Thunderbird (MPL-2.0, https://www.thunderbird.net; replaces partly): Thunderbird is a free, open-source email app for Windows, macOS and Linux that also includes calendars and contacts, with an Android app for email. It suits people who want to manage their email and calendars in one desktop program without relying on a big tech company.
Compare it with my project or idea below. Tell me which projects overlap, what I could reuse instead of rewriting, and what mine does that none of them do.
My project or idea:
