What are some alternatives?
When comparing CitySocializer and Orbit, you can also consider the following products
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Tox - Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Eventbrite - Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.
Kickstarter - Kickstarter is the world's largest funding platform for creative projects. A home for film, music, art, theater, games, comics, design, photography, and more.
Riot.im - Open source interoperable collaboration app.