Zendesk

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Zendesk is web-based helpdesk and customer support portal with unique possibilities of integration, access from modern mobile devices and connections with social networks. Currently serving 30 000 000 customers across 100 countries.
Key Features
Supported Languages
Arabic, Chinese (Simplified), Chinese (Traditional), Czech, Danish, Dutch, English, Finnish, French, German, Hebrew, Hungarian, Indonesian, Irish, and much more
Devices Supported
Android, iPhone-iPad, Linux, Mac, Open-source, RIM-BlackBerry, Web-based, Windows, Windows Phone
Data Exchange Format
REST API, CVS formats
Support Options
FAQs, Forum, Knowledge Base, Online Support, Phone Support, Video Tutorials
Certifications
Safe Harbor, TRUSTe, Verisign
Other Features
easy integration with Salesforce, Sugar CRM, or GoodData
Zendesk Review

Zendesk currently offers everything you need to ensure high-quality customers support across large and small business companies as evidenced by resonant names from various fields such as SAP, Grupon, Twitter, Gawker Media and many more. It allows management of tickets obtained from conventinonal channels such as phone, chat, mail, or web form, but also from recently very popular channels like Twitter, Facebook, and some popular smartphone apps, such as IPhone, Android, Blackberry. 

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