Paul Boese, better known as Axlen, released two freeware programs for the Sega Dreamcast. One of those was a demo a game called 3D Invaders, an original freeware game based on the arcade classic Space Invaders. The other was a port of a simulated life program called DCFloys.
He also ported the Manchester Nurbs Library to KallistiOS, and ported 3D demo-scene demos along with source code. His last contribution to the Dreamcast before he became disinterested in Dreamcast development was a USB version of the coder's cable that allows a programmer to send a binary from a computer to a Dreamcast. He released the schematics for the cable for anyone who is interested in building their own.