Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

Optingun - Optingun helps online businesses to create forms to convert website visitors into subscribers using action driven popups and social optins.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

Novocall - Novocall converts web visitors into sales calls in seconds.

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

BetterContactForm - BetterContactForm provides a solution to companies for building contact forms on the web or mobile site.