Jeroen Domburg, aka Sprite_tm, is a hardware and software hacker, and has created a portable hand-held Vectrex, which he showcased at the recent Hackaday Supercon.
His build, which uses FPGA board, a mini CRT (from an old video intercom), can play original Vectrex carts, as well as a range of home-brew and “back up” carts using a micro SD card.
You can see his Hackaday talk here: