FreeDoom Gameplay
FreeDoom is essentially an open-source version of the original Doom, with all different graphics, sounds, and so forth. It's a pretty decent game, though I will say that it's certainly got that "unfinished and unprofessional" look and feel.
If you want to play it, you'll need a source port. I recommend ZDoom (even though you'll probably need a frontend to play something like FreeDoom): http://zdoom.org/Download
Here's a reliable frontend for ZDoom (It makes it quick and easy to play lots of different Doom-based games in ZDoom): https://zdoom.org/wiki/ZDL
You can download FreeDoom here: https://freedoom.github.io/
You can join my official Steam group here: http://steamcommunity.com/groups/dwtgaming
You can follow me on Twitter here: http://twitter.com/#!/DWTerminator
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FreeDoom Statistics For DWTerminator
At present, DWTerminator has 13,702 views spread across 1 video for FreeDoom, and less than an hour worth of FreeDoom videos were uploaded to his channel. This is less than 0.01% of the total video content that DWTerminator has uploaded to YouTube.