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

Looklet - Looklet provides retailers with an efficient in-house studio and creative styling tools to produce high quality dynamic fashion images.

UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.

Shopperations - For a shopper marketing collaboration system that tracks budgets, automates reporting & calendars, & streamlines post-event analysis

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

Trailblazer - A new architecture for Rails.