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#2 Pretalx
Open‑source conference submission and scheduling platform with speaker‑centric workflow, review system, and agenda builder.
#3 Frab
Free, Ruby‑based conference management suite for CFP, speaker management, scheduling, and public program publishing.
Rails‑based event manager for conferences, meetups, and workshops; handles registrations, payments, and agenda publishing.
#5 Open Event
FOSSASIA’s full‑stack open‑source solution for event websites, ticketing, agenda, and speaker management.
#6 Attendize
Laravel‑powered open‑source ticketing and event registration system with customizable checkout, QR tickets, and reporting.
Free core plugin for WordPress that enables event registration, ticketing, and basic attendee management.
#8 Odoo Events
Free community module of the Odoo ERP suite; lets you create events, manage registrations, and sell tickets.
Web‑based agenda builder and attendee app; free plan supports up to 100 attendees and basic scheduling.
Popular event platform; no fees for events that are free, offering registration pages, ticketing, and basic analytics.
Simple RSVP and ticketing tool with a free plan for up to 100 guests and basic customization.
Free event registration and ticketing for small events; includes email reminders and simple reporting.
#13 SimpleAgenda
Free online agenda creator for conferences; lets you publish schedules, speaker bios, and session details.
Drag‑and‑drop event website builder with free tier for basic events, including registration forms and ticketing.
Low‑cost ticketing platform offering a free plan for events with no ticket sales (free events only).
Event platform with zero fees for free tickets; provides event pages, RSVP, and basic promotion tools.
Customizable registration forms and ticketing; free plan includes up to 50 registrations per event.
#18 CiviCRM Events
Open‑source CRM extension for managing event registrations, payments, and participant communications.
Free Drupal module suite for creating event listings, calendars, and registration forms within a Drupal site.
Core Joomla! extension for event creation, ticketing, and attendee management; free version supports basic features.
#21 Google Forms
Simple, free form builder that can be used for event RSVPs and basic registration data collection.