I found a redone version of Starsiege: Tribes that'll work on newer computers for whoever wants to play it with bros.
Click on the red underlined word "Tribes" in the first sentence and you'll download the zip.

tribes0.com/

Tribes.exe is what you need to launch to play.

I had a problem with colors in fullscreen- use OpenGL rather than the software renderer for higher resolutions and better colors.

It's kind of a complicated game, so play the tutorial to get a hang of the basics. It's found under "Single Player Training" after you've created a profile and hit "Next."

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I haven't found any good servers since most of them are empty so I went ahead and set one up.

It's called: "OFFICIAL /v/ SERVER"
...and it shows up at the bottom of the list, typically.