Cura

Cura is a so called "Slicer" or slicing software.
That means, basically what it does is to take your 3D Geometry and convert it into Gcode Paths that your Printer can interpret and print out.
The finished machine code is then transferred to the printer to print it out, which could happen via an SD Card, USB Cable or over Network. It is develloped by Makerbot and an Open Source Community on Github. It is updated quite frequently but beware when it reminds you to update your Verion as there are often unknown bugs in the new Version. You can see an screenshot of the changelog after an Update:

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