Your a Doom player eh? Want to check out my Doom II mod? It comes with everything that you need to play it, and it has its own install. It isn't skulltag, it uses ZDoom. But if you wait longer, the next update will use GZDoom and will have a ton more work done to it. Its called Imminent Firestorm, check it out if you want.
http://TerrorizedProductions.webs.com/