I have expertise in designing client managment systems along with customer support softwares.
Some details of what we can use for your customer support portal,
You can create multiple users, search tickets, convert POP3 emails into tickets, create custom priorities and much much more.
Easy to use with a clean design
Responsive Design and Mobile Ready
Bootstrap 3.2 Framework
Redactor 10 WYSIWYG Editor
HTML Tickets and Replies
Gravatar
Ticketing Features
POP3 Downloader (create and reply to tickets via email). Supports multiple POP accounts.
Mass Open/Close/Delete/Merge Tickets
Multiple File Attachments
Advanced Ticket Search
Departments (can assign users to multiple departments)
Transfer Departments & Assign Users
Guest Portal
Staff Collision Detection
Private Replies and Files
CC Tickets
Customise
Priorities (with custom colour)
Status (with custom colour and global open/closed type)
Custom Fields (Types: Text Input, Text Area, Dropdown, Date and Date/Time. Staff Only or End User Viewable)
Canned/Predefined Responses
HTML Email Templates
Language translation support
Timezone
System Features
Full web installer
SMTP Support. Supports multiple SMTP accounts.
User Registration & Forgot/Reset Password
Update Checker and Auto Upgrader
Private Messages
and much much more