This is a project I've been working on for more than four years. It's a GZDOOM project that uses the doom2 engine (and you need the doom2 wad to play it), but spiritually it is based on the gameplay of Hexen. you can download it here:
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Thoughts? Comments? Harsh criticisms?
I should warn you not to play on harder difficulties right away. Map 2 becomes ridiculously cryptic at anything beyond "normal" difficulty. I thought I was doing something amazing at the time, but when I realized what I was doing wasn't necessarily easy on the player, it was already done.