Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
QuickMark - QuickMark makes everything possible.
MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
Plivo - Plivo simplifies your customer engagement.
ZXing - Barcode Scanner for Android