Top pick · highest health
Rallly
Create polls to vote on dates and times (alternative to Doodle).
★ 5.3k 753 commits / 90d ⟳ today AGPL-3.0 Docker
Category
Open source booking and scheduling
Event scheduling, reservation, and appointment management software. This page ranks 9 open-source booking projects by a health score recomputed every night from repository data; nothing else affects the order. Rallly leads at 95/100 with 753 commits in the last 90 days and 5.3k stars, followed by Hi.Events (94) and LibreBooking (92). 9 of the 9 score 70 or above, 5 publish a Docker image, and the median health is 85. GPL-3.0 is the most common licence, carried by 4 of them. Between them they stand in for Eventbrite, Calendly, Doodle and Slido. The score weighs commits in the last 90 days, release recency, stars, archive status and Docker support; a low number means low measurable activity, not low quality, so a finished, stable tool can legitimately sit lower down.
updated Oct 2026 9 tools ★ 81k stars 5 with Docker median 85
Best for…
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Most starred
49,538 stars on GitHub, the largest community in the category.
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Most active
753 commits in the last 90 days, the fastest-moving codebase here.
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Most permissive
MIT licence with health 75/100: the strongest option if you need to embed or fork commercially.
Ranked by health
Table view
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Hi.Events
Event management and ticketing platform for conferences, concerts, and more. Offering customizable event pages and embeddable ticket widgets.
★ 4.1k 106 commits / 90d ⟳ today AGPL-3.0 Docker
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LibreBooking
Resource scheduling solution offering a flexible, mobile-friendly, and extensible interface for organizations to manage resource reservations.
★ 840 134 commits / 90d ⟳ 2 days ago GPL-3.0 Docker
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Seatsurfing
Webbased app to book seats, desks and rooms for offices.
★ 316 333 commits / 90d ⟳ today GPL-3.0 Docker
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Easy!Appointments
Allows your customers to book appointments with you via the web.
★ 4.5k 129 commits / 90d ⟳ 4 days ago GPL-3.0
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OpenSlides
Presentation and assembly system for managing and projecting agenda, motions and elections of an assembly.
★ 661 16 commits / 90d ⟳ 10 days ago MIT Docker
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QloApps
Customizable and intuitive web-based hotel reservation system and a booking engine.
★ 14k 735 commits / 90d ⟳ 2 days ago OSL-3.0
| # | ||||||
|---|---|---|---|---|---|---|
| 1 | Rallly Docker | 5.3k | 753 | AGPL-3.0 | today | |
| 2 | Hi.Events Docker | 4.1k | 106 | AGPL-3.0 | today | |
| 3 | LibreBooking Docker | 840 | 134 | GPL-3.0 | 2 days ago | |
| 4 | Seatsurfing Docker | 316 | 333 | GPL-3.0 | today | |
| 5 | Easy!Appointments | 4.5k | 129 | GPL-3.0 | 4 days ago | |
| 6 | Alf.io | 1.6k | 57 | GPL-3.0 | yesterday | |
| 7 | Cal.diy | 50k | 26 | MIT | yesterday | |
| 8 | OpenSlides Docker | 661 | 16 | MIT | 10 days ago | |
| 9 | QloApps | 14k | 735 | OSL-3.0 | 2 days ago |
How the booking tools compare
Rallly edges Hi.Events 95 to 94. Cal.diy has the largest following at 50k stars, yet ranks #7 of 9, held back mostly by Docker support (no Docker image).
The most recent release is Seatsurfing v1.139.0, published today. None of the measured options scores under 40. By stack, Nodejs (3), PHP (3) and Java (1) are the most common. Cal.diy and OpenSlides are permissively licensed; Rallly, Hi.Events, LibreBooking and 4 more are copyleft.
Booking and Scheduling: common questions
What is the best open source booking tool?
By Repoly's GitHub health score, Rallly at 95/100 (753 commits in 90 days, v4.16.3 from 4 days ago). Hi.Events is next at 94. The score measures maintenance, not features, so shortlist the top few and try them.
Which booking tools are the most actively developed?
Rallly (753 commits in 90 days), QloApps (735 commits in 90 days) and Seatsurfing (333 commits in 90 days). Commit activity is 35 of the 100 health points, the largest single term.
Which booking tools can I run in Docker?
5 of 9 publish a Docker image or Compose file, led by Rallly, Hi.Events, LibreBooking, Seatsurfing and OpenSlides.
Which booking tools have a permissive licence?
2 of 9: Cal.diy (MIT), OpenSlides (MIT). 7 are copyleft.
Which paid products can open source booking tools replace?
Eventbrite (Hi.Events ranks highest here), Calendly (Rallly ranks highest here), Doodle (Rallly ranks highest here) and Slido (OpenSlides ranks highest here).
