Sherlock - Sherlock provides insights on user engagement for product makers.

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

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

Zoho Desk - Industry's first context-aware Helpdesk Software

HelpJuice - Helpjuice is easy-to-use knowledge base software that guarantees. 50% less support emails and happier customers.

Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.