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