It doesn't look like anything special, just a standard 3 pin 0.1"/2.54mm pitch pin connector.
To connect those sensors to your Pi you would need to make a small circuit. I would build it on stripboard (veroboard). Buy some 0.1"/2.54mm pin strips and cut them down. Then solder onto the board.
You need to connect all the Power pins (probably red wire) of the sensors to Pin 1 on the GPIO connector (3.3V), all the Ground pins to any of the GND pins on the GPIO connector (pin 6 or 9 for example), and all the data pins to Pin 7 on the connector (GPIO4). You also need to put just one 4.7K Ohm resistor between Pin 1 and Pin 7 on the GPIO connector to provide a pull-up voltage.
Then you need to enable the sensors by editing your config.txt file (sudo nano /boot/config.txt) and add the line
and reboot or it to take effect. Then you should see your sensors in /sys/bus/w1/devices