https://github.com/AndrewCPU/Easy3D is the lightweight version of this.
Hi! So this is a program that renders a 3D world, does basic world generation as well as some lighting calculations. There are particles, and an inventory system.
You will also find faries coming out of the light blocks around the island. (You can spawn faries by pressing 'F')
Give it a Watch / Star if that makes you happy.