Level 7 Systems Ltd.

http://websitechat.net/en/download

Mobilkom Austria

http://www.kvats.net

People Fone AG

https://www.peoplefone.at/content/softphone.php

https://www.peoplefone.ch/content/softphone.php

https://www.skfon.sk/content/softphone.php

https://my.plfon.pl/content/softphone.php

Vodafone DE

http://www.vodafone.de/business/festnetz-dsl-firma-buero/127651.html