Clientflow - Project Management & Shared Inbox for Client Service teams
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Task Pigeon - Create, assign & manage your teams everyday tasks
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