Welcome. Normally I would keep downloads on github, but because github has stopped hosting binary/installer downloads as of January 2013, I have moved the installers to Amazon S3.
Windows installer should be straightforward. The Grbl Controller was built with MinGW and all required DLLs are provided. You will probably need to visit the Arduino web site to install USB serial drivers.
Mac has two installers, the 64 bit installer is for modern Mac OSX versions while there is one 32 bit Intel installer for older Mac Minis and Macbooks. Sorry, PPC is not provided. To properly run GrblController on the Mac, you will need to download and install the FTDI drivers first!
Note – I have decided not to host the Linux/Raspberry Pi installers as they are difficult to get running – I recommend you build the Grbl Controller using a process as documented here.
No longer restarts COM connection, rather, position is maintained as long as possible. Button to zero position using gcode is used instead. Position is now reported by requesting it from Grbl instead of computing it. Optional new “aggressive preload” mode sends commands as fast as Grbl can process them – Caution: motions may be faster than normal mode and will definitely see how good your stepper controller heat sink is!
Original version. Reinitializes COM port for every file send (a non-optimal solution to zeroing position)