OpenTouch Click2Call extension for Gmail and Google Contacts using OTC PC or OTC PC One
https://melotel.com
SpectrumVoIP
https://bitree.ru
https://www.thirdlane.com
https://openrainbow.com
https://justcall.io
https://callfrombrowser.com
CTI-Telephony
SoftSwitch Devs
KOTRS
Worcester Apps
Agentur Simon