Develop own apps

Can I develop my own apps for Homey Bridge, if so how? (I have a number of Nexa devices, but Homey only support very few of them - Can I do something about this by myself?)

Homey Bridge is just a device that is used as an antenna and doesn’t run apps itself, if you mean Homey Cloud, then you could develop an app, but you’ll need to keep it running (you can’t install it on your Homey in the cloud) on a PC, and it will never end up on the app store:

Verified apps

Because Homey Cloud is offered for a mainstream audience, we want to ensure every app is of great quality. To assist with this, we offer code-level support and in-depth app reviews as part of the Homey Verified Developer subscription. This subscription is required to publish your app to the App Store when targeting "platforms": [ "cloud" ] or "platforms": [ "local", "cloud" ] .

Only official app integrations will be approved. This means an app submitted by a brand or submitted by a third party developer commissioned by said brand.

Source is here

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Does that mean you could actually have a few apps running on a Raspberry Pi, with a Homey Bridge in the house? I miss a few apps, but the source code of the ones I want is available on GitHub.

If you are on the verge to even try that (as the app might not even run without any change, maybe not even possible to “run” multiple apps at the same time, don’t think anyone has ever tried that), you are probably better of buying an Homey Pro (2023) or go start running Home assistant on the very same PI.
As Homey cloud (bridge is just an antenna), is probably not for you, it is (mostly) for starters.