This is a desktop audiobook player for Windows 10/11. Requires .NET Desktop Runtime x64.
It features a library for you to import your audiobooks into, a search bar, a mini-player and a full-screen player. Additionally, you can set Audibly as the default application to open your audiobooks (.M4B files).
This is an open-source project which you can view @ https://github.com/rstewa/Audibly.
It currently only supports .M4B (MPEG-4 audiobook file type) files.