Here is some interesting Forth software, including a Space Invaders game and an IP networking stack including IP, ARP, UDP, DNS and DHCP [1]. It runs on the J1 custom Forth CPU built on an FPGA [2]. The author says it was originally designed to run an array of Ethernet cameras on a robot.

1. https://www.excamera.com/files/j1demo/docforth/

2. https://www.excamera.com/sphinx/fpga-j1.html

Edit - also mentioned here by adastra22, I see.