yuuflow - Simple yet flexible project management

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.

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

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

Height - Height is a project management tool for your whole team.- Task lists to keep your team synced- Chats to keep conversations about work in one place- Lightning fast with Cmd-K, custom shortcuts, and jump to- Integrations to automatically update tasks

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