GreatLeapForwards.com has been redone a handful of times since 2003, in various versions of ASP.Net.
The current version of GreatLeapForwards.com is in ASP.Net Core 3 with Razor pages
Once that was updated, I started to create new subdomains;
ASP.Net Core3 Blazor server-side
Blazor client-side WASM
Vue is still a work in progress
A lot of the content comes from the primary domain, data being transmitted in REST calls