Block Together - A useful tool which helps you block trolls on Twitter.

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

Secateur - Use Secateur if you want to temporarily or permanently block or mute (or both block and mute) a Twitter account and all its followers.

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

Moderate - Identify, mute, and block trolls in your Twitter feed

Userlike - Userlike is free live chat software for website and mobile support.