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The 'LPT Interface' application is great for students. With 'LPT Interface' pupils can write & read the parallel port's: Data Port (8 bit), Control Port (4 bit) and read Status Port (4 bits).
K8055 User Interface is a Mac OS X based Cocoa application for controlling the Velleman K8055 USB interface. Included is a static library which can be used for developing other applications and closely replicates the Velleman Windows .DLL functions.
This project is a tool (soon) and an application to control a NXT Brick from Lego, over Bluetooth (and eventually USB, but it's not supported yet). This is only for Mac OS X.
LegOSX-Direct allows to control a Lego NXT robot through direct commands using the native USB and Bluetooth libraries of Mac OSX. It has a minimal GUI to illustrate interaction.