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

Clientflow - Project Management & Shared Inbox for Client Service teams

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

Client Portal - A client-friendly way to keep your projects organised

HelpScout - Help Scout is a simple, straightforward way to provide excellent support

Task Pigeon - Create, assign & manage your teams everyday tasks