Binary Eye

Works in portrait and landscape orientation, can read inverted codes,
is Material Design and can also generate barcodes.

Uses the ZXing-C++ ("Zebra Crossing") barcode scanning library.
Supported barcode formats are: AZTEC, CODABAR, CODE 39, CODE 93, CODE 128,
DATA MATRIX, EAN 8, EAN 13, ITF, PDF417, QR CODE, RSS 14, RSS EXPANDED,
Telepen, UPC A, UPC E and UPC EAN EXTENSION.

This is open source:
https://github.com/markusfisch/BinaryEye