Strava - The #1 app for runners and cyclists

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

MyFitnessPal - Track the number of calories that you consume each day with MyFitnessPal. The app also lets you create a diet and track the exercise that you complete each day whether it's walking, running or some other type of program.

Event Hunt - Startups and Tech Events Curated By Locals

Runtastic - Runtastic offers a series of fitness apps that can be used to track your running, walking, hiking, and cycling, as well as many other fitness routines. Read more about Runtastic.

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets