Sure, we use it in-house all the time. The last released version is from the summer of this year and since then not a lot has changed on the library. It is stable and used in production.
But also check out BANano (
https://www.b4x.com/android/forum/t...with-abstract-designer-support.99740/#content), my alternative WebApp library. It may suit your needs better depending on your knowledge of javascript/css/html.
I'm in the final stages of writing the BANanoServer library which will then, together with BANano for the Browser side, handle the server side of a WebApp.
https://www.b4x.com/android/forum/t...ananoserver-going-full-circle.111406/#content just like what ABM does now.