Hearse

Hearse is a program that exchanges bones files. It is to be run after NetHack has left a bones file, and it will connect to a central server. If Hearse finds that the local copy of NetHack contains new bones files it will upload them to the server and download random bones files of the same dungeon level. It is even possible to receive bones files that originated from the connecting computer.

The Windows version of Hearse and other versions are not the same. The configuration file for the Windows version allows for extra bones files to be downloaded for each file uploaded. Instead of an even ratio, it is possible to download up to five bones files for each one uploaded.

You can read more at the hearse homepage.