There is group management, ticketing without fees, call for proposals management, mailings, invoicing, sponsorship management et more. We charge 49/199 USD on per-event basis (no monthly fee, no % off ticket sales) depending on the event size. Free events are free and non-profit are 50% off.
[1]: https://eventil.com/ [2]: https://polyconf.com/ [3]: http://13.rupy.eu/