Hesk is a free PHP helpdesk software that runs with a MySQL database. It allows you to setup a ticket based support system (helpdesk) for your website. Your customers are able to submit support tickets and the staff has a nice web based interface to reply to and manage tickets. Features include multiple staff logins, categories, powerful ticket search functions, easy-to-use web interface, integrated knowledgebase, e-mail notifications, custom fields, file attachments, canned responses and more. You can completely customize the look of the script by editing header, footer and style files!