OK so NetHack is undeniably the best game ever made and I'm sorry it took me until my 20's to realize that. Hopefully it didn't take you so long.
I am splitting from the original roguelike topic since I discovered that I actually hate roguelikes and only enjoy NetHack-likes such as WazHack, etc.

Here's some useful links:

The greatest game you will ever play
http://www.thegreatestgameyouwilleverplay.com/

Official NetHack website
www.nethack.org

Telnet:
Code: [Select]
telnet nethack.alt.org

GL port of NetHack:
http://glhack.sourceforge.net/

NetHack variant: UnNetHack (like)
http://sourceforge.net/projects/unnethack/

NetHack variant: Slash'Em (Haven't played yet)
http://www.slashem.org/

Android port of NetHack (like)
https://play.google.com/store/apps/details?id=com.tbd.NetHack

Android port of UnNetHack (like)
https://play.google.com/store/apps/details?id=com.tbd.UnNetHack

iOS port of NetHack
https://itunes.apple.com/us/app/id962114968

Nethack Wiki (SPOILERS)
http://nethackwiki.com/wiki/Main_Page

Frontend: Vulture (like)
http://www.darkarts.co.za/vulture-for-nethack

Right now Vulture is my favorite way to play.
I can't play ASCII games with no sound in 2015. Not that hardcore, sorry!

As most of you know I am a WazHack pro, but to NetHack I am a huge N00B! One day I will ascend, though!
I can already tell this game is much harder than WazHack!

Are you a NetHack pro? Tell us about it in the comments below