VDownloader is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is youtube-dl, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to VDownloader and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to VDownloader are Youtube-DLG (Free, Open Source), 4k Video Downloader (Freemium), Video DownloadHelper (Freemium) and ClipGrab (Free, Open Source).
aoydl stands for "Aczkolwiek's own youtube-dl" and is a software written in POSIX shell that retrieves youtube direct video (or audio) urls. It can be used with wget, mpv or any other software through subshells or pipes.