Today, it has a F17A video processor that enables VGA output: https://dnotq.io/f18a/intro.html
And a FinalGROM99 cartridge, so I can have an SD card with all the program cartridges loaded. https://endlos99.github.io/finalgrom99/
There's still a community of fairly active development for retrogames, and some of them are quite good given capabilities of the hardware. My niece particularly enjoys a marble game called Skyway, try it on the online emulator at https://ti99ers.com