Where can I download the source code of openHAB?

Development IDE & Build
1

Can I modify the code to integrate an unsupported gateway?

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2

Github
Read the openHAB doc about developing a binding
Yes you can. You are actively encouraged to do so provided you share the code in github

3

what gateway are you thinking about?

You might want to check if someone is not already busy on a binding.

4

Feibit gateway
the gateway produced by a Chinese company, Is a zigbee gateway

5

have you tried https://www.openhab.org/addons/bindings/zigbee/ ?

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