Other Drawing apps for Note Air + github

As u know, the default Note app, is the only drawing app that works with the provided Pen.

I searched a lot & couldn't find any android drawing app that is compatible with Boox Note Air & it's Pen.

I heard that the reason for this, is that the Note app is using a specific code to work with Boox pen. I heard that there is an open-source code that is available for this purpose, in github. I searched github & couldn't find it.

Could u please give me the link to that github source, So I could send that code to some developers of android drawing apps, so they could implant it in their apps.

Having more drawing apps options in Boox devices, would make it more popular & also increases their sales, for sure.