EventBrite Online RSVP - EventBrite Online RSVP is a cost-effective event management software that provides services to help businesses organize, invite people together for an event, and sell tickets.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Rsvpify Virtual Events - Rsvpify Virtual Events is an event management tool that provides you various functionalities ranging from setting up the entire event to selling the tickets online to the targeted audience.

C++ - Has imperative, object-oriented and generic programming features, while also providing the facilities for low level memory manipulation

Whoozin.com - Free RSVP Online | Track RSVP’s and Sell Tickets for your events and recurring meetings.

Drift - A messaging app that helps you grow your business.