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File2QR is an Android app that let you encode any small file on the filesystem to a QR code. Conversely, you can decode the encoded file from the generated QR, with mobile's camera. File2QR is built on ZXing library.
JetClass, Java net-class application, allows virtual lectures to be held by teachers and students located in front of their computers, somewhere around the globe. It's written in Pure Java, relying on CORBA for network communications.