tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page

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

LiveChat - LiveChat - premium live chat software. Approach customers directly on the website, make connections and drive more sales using LiveChat.

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

Crisp Chat - Multi-channel customer support software

Bigtent - BigTent is a web-based organization and communication portal for groups.