Wikivoyage - the free worldwide travel guide that anyone can edit.
Event Hunt - Startups and Tech Events Curated By Locals
Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
Iventlist - Create an app for your event in minutes 🎟️
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
Zoho Backstage - Plan, run, and analyze your event— all from one place