Lizard is my own personalized variant of the newt interface. It always shares the latest newt codebase while adding a few of my own patches that increase user experience (in my opinion). Lizard is how I play NetHack or Slash'EM.

Additions to Lizard over tha vanilla NE.W.T:
Dark rooms are a different tile to unexplored rooms. So exploring an area like the gnomish mines is much less painful.
Passageways are shown. Passageways on the side of corridors are visible. Again this is a change that allows you to better judge which areas you have not yet explored.
Line of sight, you now have a visible line of sight and are able to easily see which areas might have monsters that you cannot actually see.
Brad's Pit, a minor patch of my own, for amusement value only ;)
Chess Moves, you can set the speed of monster movement as well as player movement. When set to walk each monster will move individually as if you were watching a move for move animated playback of a game of chess.

All of the above mentioned changes work for the tty/console view as well.

License: free

Additional System Requirements: SDL
SDL_ttf
SDL_mixer
SDL_image