Whitespace.
See who already built your idea — and the space they left open.

CLUSTER OPEN-SCHEDULING-SOURCE · 15 ENTRIES · EARLIEST ENTRY 2026-09-24

Open-source scheduling platforms

This cluster consists of open-source scheduling tools for sharing availability and booking meetings. With only four dated entries before the index start and three undated members, the dated history is too thin to read a shape from. Among traction leaders, 'punctual' leads with 107 stars, while two related pull-request entries show zero stars.

Entry timeline

ENTRY TIMELINE

DEC 2021: 1MAR 2026: 1JUN 2026: 1AUG 2026: 5SEP 2026: 7
DEC 2021SEP 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 6 hand-coded · 9 unlabelled

Operator · 3 hobby · 5 commercial · 3 open source · 4 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 15 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01punctual107★29 daysliveopen sourceSelf-hosted scheduling tool that lets people book meetings and appointments online, offered as an open-source alternative to Calendly without seat limits.
  2. 02cal_dot_com__cal.com__kai__PR22345__202609240★20 dayslivehand-codedcommercialOpen-source event scheduling platform that lets users book meetings and manage availability with team features.
  3. 03cal_dot_com__cal.com__kai__PR22532__202609240★20 dayslivehand-codedOpen-source scheduling application that lets users book meetings and manage calendars.
  4. 04cal_dot_com__cal.com__kai__PR14740__202609240★20 dayslivecommercialOpen-source appointment scheduling platform that lets users share booking links, manage calendars, and accept meeting reservations.
  5. 05cal_dot_com__cal.com__kai__PR14943__202609240★20 dayslivehand-codedcommercialOpen-source meeting scheduling platform that lets users share availability and book appointments with others.
  6. 06cal_dot_com__cal.com__kai__PR10967__202609240★20 dayslivecommercialOpen-source scheduling platform that lets people share availability and book meetings without email back-and-forth.
  7. 07cal_dot_com__cal.com__kai__PR10600__202609240★20 daysliveOpen-source scheduling app that lets users share availability and book meetings, serving as an alternative to Calendly.
  8. 08holreservations0★13 daysliveOpen-source meeting scheduler that syncs Google and Outlook calendars and creates events with video links.
  9. 09core829-bookings0★1 molivecommercialCustom booking platform with public calendar, team workspace, and embeddable widget for customer scheduling.
  10. 10scheduling0★2 molivehand-codedhobbyOpen-source appointment scheduler that generates shareable booking URLs so anyone can reserve time slots instantly without signup.
  11. 11EasyBook0★1 mo—Booking platform that lets users find, book, and manage shared institutional resources while preventing scheduling conflicts.
  12. 12ScheduleAI0★2 molivehand-codedopen sourceAn open-source scheduling platform for self-hosted personal use, offering calendar and booking features.
  13. 13when2meet0★2 mo—hand-codedhobbySelf-hosted scheduling tool that lets participants mark availability on a grid to find the best meeting time.
  14. 14nextcloud-app-calendar_resource_management0★4 moliveopen sourceCalendar add-on that manages shared resources like rooms and equipment for scheduling within a self-hosted groupware platform.
  15. 15Slotify0★6 mostalelivehobbyScheduling platform that lets users define availability, generate bookable time slots, and manage meetings with automated email notifications.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.