SkillMint - Find, meet and rate people with common skills and interests. Community-driven rating system.
pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features
SurfersList - The ultimate online solution for finding, buying, and selling new and used surf equipment.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
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.