Issuetrak - Issue tracking software for help desk and customer service
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
AzureDesk - Azuredesk.co is an online customer service software and support ticket help desk application for small business and fast-growing companies. Get a free trial today!
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Vision Helpdesk - Help Desk Software, Multi-Company Help Desk, ITSM Service Desk & Live Chat Software
DuoCircle - DuoCircle provides enterprise spam filtering and email management solutions.