3CX Voice Application Designer - 3CX Ltd.C
  Visual IVR designer. Build and deploy powerful custom IVRs with zero programmingly knowledge.

VadTools IVR Development Components - SWS Development, LLC
  Drag and drop components to add to your toolbox in the 3CX Voice Application Designer

3CX Assistant - 3CX Ltd.
  Windows utility to manage calls, extension, see user statuses and queues and much more

3CX VoIP Phone - 3CX Ltd.
  Light weight VoIP softphone for use with 3CX or any SIP Voip PBX or even direct to a VoIP provider

3CX Fax Send Module - 3CX Ltd.
  Send faxes from anywhere in the network using Microsoft Fax