Novocall - Novocall converts web visitors into sales calls in seconds.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Smallchat Beta - Slack integration for chatting with visitors to your website
Callpage - Turn website visitors into sales calls. Use CallPage and provide immediate free phone callback to your leads in 28 seconds.
Firehose Chat - firehosechat.com