As what I guess now classes as a new-years update, download links are now provided on for every reviewed map, along with the Speedmap Contests getting a compilation link on their intro page. Layout limitations mean the placement currently isn't ideal, but I figure having them is better than not having them.
As stated on the reviews, Unreal Archive links are considered the "official" downloads and should provide the newest and most compatible version of each mod unless otherwise stated, with the least chance of outages or deletions.
For reference most of the links were sourced from these two forum threads, although a couple aren't present there. These sources should be unnecessary now, but they do have some extra links in case something goes wrong with the site downloads, as well as a place to post potentially new download repositories: