I once had an idea for a web-based EVE-like game which would be written in PHP and utilise only HTML and maybe a bit of Javascript, meaning it would be compatible with almost all browsers (including Amiga browsers).
I made a good start, with solar systems containing planets which could be landed on and traded with, and hyperspace jumps to travel between solar systems. It also had a comms panel for talking to players in the same solar system as you.
Sadly I got stuck on combat (hard to get that working when the game isn't "real-time") and also no longer have time to work on it.
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moto