NOSE (NHL Old-School Editor) is a powerful, easy-to-use game editor for the Sega Genesis versions of EA's NHL series (92-98). Originally written by @wboy.
This post will contain or link to the latest NOSE version.
1.2d (adamcatalyst update 2023): soonish, will fix the .ini situation and add some popular uniform hacks
1.2c (smozoma update 2021): https://forum.nhl94.com/index.php?/topic/20863-nose-newtest-versions/
1.2b (wboy version): https://forum.nhl94.com/index.php?/topic/14217-nose-12b-download/
The installation instructions are in the 1.2b post. Be sure to install the files from Step 3 AND Step 4.
It's a Windows program. See here for how to run on a Mac.