Public - Group chats.

Talkus - Chat with your website users from Slack

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.

Chalk - Chalk is a calculator that tries to do right what others do wrong.

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