Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
SendPulse - Maximizing e-mail marketing open rates automatically
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
mlmmj - Mlmmj is a simple and slim mailing list manager (MLM) inspired by ezmlm.
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.