This is the most “modern” linux arch you also find called “64-bit” and the one you will want to use on devices with more than 4 GiB of RAM.
| HTTP | https://downloads.openwrt.org/releases/packages-18.06/x86_64/ |
| FTP | ftp://ftp.halifax.rwth-aachen.de/lede/releases/packages-18.06/x86_64/ |
See Mirrors for more download sites.