This is a great idea, it's like an agency but without the shared destiny thing (and hopefully, without the drama).
Have you thought about adding independent designers and artists to the list? This could be helpful for projects where icons or custom UI is involved, and the developer might not know anyone or might not know who's free.
"Kind of like how travel is said to broaden the mind, I think learning (or at least dabbling) in a lot of different languages broadens a developer’s mind."
You're so, so right about that.
Do you still have any of the old games or programs you wrote? I wish I had mine, but everything was on floppies that are long gone now. Curse the transience of physical media!