Windows Application Negative Screen https://zerowidthjoiner.net/negativescreen. Source: about 1 year ago

After some research I found NegativeScreen, which does exactly what I want, the only caveat is that it affects your entire screen. I'd like this for only a selected few windows, a free program if possible. Source: over 1 year ago

And if your apps don't support dark mode, force them to: https://zerowidthjoiner.net/negativescreen. Source: about 2 years ago

There's an odd little retro dungeon crawler called Paper Sorcerer that might work for you. It's always high contrast, but I think some areas are light mode instead of dark mode so you might need something that can invert the colors at points (I'm not sure if something like NegativeScreen would work in games). Source: about 2 years ago

Https://zerowidthjoiner.net/negativescreen for Windows, scroll down to the downloads section and unzip the .exe binary anywhere, preferably to the C:\Users\(your username) folder and shortcut on the desktop. Source: over 2 years ago

I recently came across YAD (https://sourceforge.net/projects/yad-dialog/), which is a improved version of dialog. Allows you to create a simple GUI, where all the entries are written to STDOUT. So, you can interface with your favorite language. For examples, see this page: http://smokey01.com/yad/. - Source: Hacker News / almost 3 years ago