FireHelp is a complete customer support solution, that includes tickets , live chat and knowledgebase.
The software is built on the idea of it being very extendable, thus providing you with all tools to help you do so.
You can checkout the demo below:
Admin panel: http://demo.firecrown.io/admin
Email : firstname.lastname@example.org Password: admin
Email : email@example.com Password: jane
Email : firstname.lastname@example.org Password: demo