Assault Cube, is usually recommended as a starting point. Source: about 1 year ago

Assault Cube should run on pretty much anything, and it's free. https://assault.cubers.net/. Source: over 2 years ago

Pretty sure AssaultCube has LAN (not sure though - https://assault.cubers.net/). Source: almost 3 years ago

Assault Cube is a simple old, free FPS game.Kinda counter strike like.It runs on anything: https://assault.cubers.net/. Source: almost 3 years ago

If you haven't heard of it, AssaultCube is a really good, lightweight game that functions as a basic FPS and is quite easy to start out in cheating with, but also has the ability to cheat in more advanced functions like aimbot once game hacking comes easier, and there are hundreds of tutorials on getting started with cheat engine in AssaultCube. (Note that while there is Online mode, stick to singleplayer since... Source: about 3 years ago

Now it's just a wallpaper changer pointed to a folder of my kids pics This one : Https://johnsad.ventures/software/backgroundswitcher/. Source: about 1 year ago

I used to use https://johnsad.ventures/software/backgroundswitcher/ and it's cool. But latest years I just stick to Snow Leopard. A bit of nostalgia. :). Source: about 1 year ago

I use https://johnsad.ventures/software/backgroundswitcher/ on my desktop PC. Find it a great way to see our travel photos that would otherwise just sit in a folder and not been seen for ages. Just set it to choose a random image from a defined folder every 10 minutes. Source: almost 2 years ago

I use John's background switcher https://johnsad.ventures/software/backgroundswitcher/. It's very customizable for every kind of setup. Source: about 2 years ago

You need a third party wallpaper manager to do that. Many of them have this feature. I use John’s Background Switcher. It can set a different wallpaper on each monitor, randomized from your collection. Source: over 2 years ago