TotalDesk is the only all in one helpdesk solution for WordPress. Including a ticket & notification system, livechat, knowledge base, report and integration module it contains all support features, that you need.
BeDesk is a self-hosted, feature packed customer support, ticketing, email management and helpdesk software that does not require any coding or server knowledge to setup.
Knowledge Base a Clean and Responsive Helpdesk WordPress Theme is best for Wiki, Helpdesk, Knowledgebase, Customer Support System, Help center or Community websites.
Multifunctional Kayako Fusion Helpdesk system with a web interface for managing tickets, emails, contacts, files, SLA contracts and tasks (for collaboration).
RSTickets! Pro is a professional Joomla! HelpDesk ticketing system that has a high level of personalization and will meet all of your customer support needs.
KnowBase - A premium easy-to-use WordPress theme for free bbPress plugin. It comes with a clean and modern functional design, is an ideal choice for your knowledge base, forum, or bulletin board website.