xivoclient 16.13 for Mac can be downloaded from our website for free. The actual developer of this free Mac application is xivo-pbx. The application lies within Communication Tools, more precisely Texting & Video calls.
From the developer:
XiVO Client is an application that connects you to the XiVO server. With this program, you can search contacts, make calls through your phone, access your voicemail through your phone, enable call forwards and call filtering, show the history of your calls, list conference rooms and members, and send faxes. It also offers several call center features.
You may want to check out more software for Mac, such as iChatMonitor, LopsterOSX or eToken, which might be related to xivoclient.