I am looking for a website chat system (paid or free) which can be hosted locally rather than through an online service. This tool is going to be used as part of a company intranet system allowing staff to communicate with members of the service desk through 1:1 chat window, which will be accessible through the intranet.
Ideally the software would need to be PHP or Javascript based since it needs to be integrated into Umbraco, which seems somewhat fussy, but I will take recommendations which don't fall into this criteria.
I have tried looking at phplivesupport, which seemed to be what I was looking for. The main issue with this was getting in touch with the company. Since support would be preferable I would like the software to still be relatively active with development/support.