QRed

QRed is Free Open-Source Tool to
1. Generate QR codes.
2.Read QR codes from Image or Scan from WebCam.
3.Customize QR codes by changing color or adding Logo in Center.

-source code:
https://github.com/LionRoar/QRed

Today’s small-to-medium-sized (SMB) businesses and large enterprises are saving on their monthly communications costs by making one simple decision: to switch to a VoIP service solution from their old, outdated Plain Old Telephone Service (POTS). By choosing a new VoIP service, these companies enjoy the flexibility, reliability, call features, and audio quality that only a VoIP service can provide. Plus, they cut their phone bill by up to 70%!