REXPaint

There aren't many dedicated programs for drawing for legacy computer terminals and game systems, but REXPaint can certainly be used that way. To save you some time, there is now a large collection of REXPaint palettes and fonts available from the new legacy systems page, courtesy of AtariAge members nitrofurano and barnieg.

You can now paint with palettes from the Atari 2600, Apple II, Commodore 64, NES, Sega Master System, ZX Spectrum, and more! (Well, you always could before, but you'd have to make the palette yourself--now someone's done it for you ;)

REXPaint legacy system palettes.

You can also draw with font sets from the Aquarius, MSX, Phillips VG 5000, ZX81, and more:

A selection of REXPaint legacy system fonts (8x8 only).

I also plan to release a new version of REXPaint soon, featuring image-wide color swapping, new file browser functions, more config options, hex color support, and whatever else I decide to tackle on the now massive to-do list.