This PHP script can be used to download a particular file if you don't know its path.
For example, to download devkitPPC r41 for Linux, you can either access its full URL: 
https://wii.leseratte10.de/devkitPro/devkitPPC/r41%20%282022-05-31%29/devkitPPC-r41-2-linux_x86_64.pkg.tar.xz
or you use this script to automatically find that file whereever it is:
https://wii.leseratte10.de/devkitPro/file.php/devkitPPC-r41-2-linux_x86_64.pkg.tar.xz