Xmind - Xmind is a brainstorming and mind mapping application.
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
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Zoho Desk - Industry's first context-aware Helpdesk Software
Coggle - Coggle is a simple, beautiful, powerful way of structuring information.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.