Lagrange is a perfect example of software that matches the #RetroEdgeTechStack ideals. It is a blend of the retro past with current tech possibilities.
Also, written in C and using SDL2 for the graphical interfaces and gpu acceleration. SDL2 allows for slick animations and scrolling without bloated web tech.
A mastodon instance created by Derek Taylor, creator of the DistroTube channels on YouTube and LBRY. Derek is an advocate for free and open source software.