Softphone Software

Bitrix24
  338
Free collaboration, communication & management tool suite
3CX
  175
Hosted PBX with CRM integration and mobile apps
Zoiper
  56
Cross-platform VoIP softphone dialer for SIP and IAX systems
VirtualPBX
  20
Tools To Connect Everyone, Everywhere.
RingOver
  6
Cloud & mobile business phone system
eVoice
  5
Small business phone software