Sprintcrowd:

World’s first live running platform Start wherever – run together. Side by side with friends and other runners, virtually, no matter location. Run for fun or challenge your friends Create your private race and invite your friends or join some of the many public races.

About Ably

Ably is an enterprise-grade pub/sub messaging platform. We make it easy to efficiently design, quickly ship, and seamlessly scale critical realtime functionality delivered directly to end-users. Every day, we deliver billions of realtime messages to millions of users for thousands of companies.

https://ably.com