php is a banger
Blazingly fast world manipulation for artists, builders and everyone else: https://www.spigotmc.org/resources/13932/
Java - Released: 20 Dec 2018 - 561
PlotSquared - Reinventing the plotworld
Java - Released: 27 Oct 2014 - 502
Simple & Lightweight Netty packet library + event system
Java - Released: 31 May 2021 - 19
Open-source paste server written in TypeScript
TypeScript - Released: 07 Jan 2020 - 1