Zandronum is a free open-source advanced multiplayer sourceport capable of running various games such as Doom, Doom II, Final Doom, Heretic, Hexen, and as well as others online. It originated from Skulltag, which was based on ZDoom and its counterpart, GZDoom.
DML is a launcher for Doom (But also Doom2, Heretic, Hexen, Chex Quest, Strife etc...) mod!
Doom Mod Loader is a doom (but not ONLY, here's the full list of compatible games) vb.net launcher for Windows that allow you to easily load your game with your favourite mods and also:
NOTE: Need Microsoft .Net Framework 3.5 to work. If your system is updated you should have it arleady.
* DML is more like "port launcher", that write the engine console parameters for you, that means you STILL NEED a modern doom port to load your mod. I've tested so far the four i've wrote, but as far a port use the console parameters linked above it will work fine!
** On Zandronum the "Disable SFX" (-nosfx) seems to do disable all sounds instead of disable only the sfx. Don't know why.