Sygic Travel Maps - Itinerary planner for independent travelers
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Wanderlog - Collaborative travel planner with combined itinerary and map
Event Hunt - Startups and Tech Events Curated By Locals
Roadtrippers - The ultimate road trip planner to help you discover extraordinary places, book hotels, and share itineraries all from the map.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets