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Raspberry Pi and General-Purpose Input/Output
Raspberry Pi 3 Model B 40 Pin GPIO Adapter Extension Board 1 to 3 40 Pin Plate Module GPIO Adapter for Orange Pi Canada/USA
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Simple Guide to the Raspberry Pi GPIO Header - Raspberry Pi Spy
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40 Pin GPIO Extension Cable for any 2x20 Pin Raspberry Pi [150mm / 6 long] : ID 4823 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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SamIdea 2-Pack 40pin Male to Female IDC GPIO Rainbow Ribbon Cable Jumper Wire for Raspberry Pi A+/B+/3 B, 20cm/8"