AirSend - Connect with People to get work done. Have conversations, share files, complete tasks, and get work done in one space.

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.

eduHund - Digital mentor for professionals

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

LinkedIn - LinkedIn is a business-oriented social networking service, mainly used for professional networking.

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