Carrd - Simple, responsive one-page site creator.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Smallchat Beta - Slack integration for chatting with visitors to your website
Message.io - Make your chat bots cross-platform
Firehose Chat - firehosechat.com
mmm.page - Dead simple, drag & drop personal websites