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
Xmind - Xmind is a brainstorming and mind mapping application.
UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
FeatureMap - FeatureMap story mapping, simple and effective realtime collaboration and collective intelligence tool.