Interhack is "a program designed to enhance your NetHack experience." It is a wrapper for Nethack.alt.org that boasts many features, including:
- An improved HP monitor that displays when it is safe to pray
- Corpse safety and side-effect identification
- More colors for menus and text
- Keeping track of intrinsics
- Extensive customization through Perl-based plugins
Interhack is best used through GNU Screen to avoid display glitches.
- Noobhack seems to pursue similar goals.