Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

4chan - 4chan is a simple image-based bulletin board where anyone can post comments and share images.

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.

Lainchan - Lainchan is a great imageboard package, actively building on it and adding a lot of features and...

SkillMint - Find, meet and rate people with common skills and interests. Community-driven rating system.

7chan - a simple image board alternative to 4chan small but still a nice community with much more rules...