NomNom is the most complete savegame editor for NMS but also shows additional information around the data you're about to change. You can also easily look up each item individually to examine its attributes, independently of a savegame, or get other useful information that are not related to a specific savegame (but enhanced if one is loaded).
A very minor issue: The app allows editing/adding super slots in vehicles' tech inventory, but the game reverts the SC to the originals - probably because unlike ships, the vehicles have no seed (or seed=0)... So, having the option available in vehicles' inventory is misleading and should disabled.
A very minor issue: The app allows editing/adding super slots in vehicles' tech inventory, but the game reverts the SC to the originals - probably because unlike ships, the vehicles have no seed (or seed=0)... So, having the option available in vehicles' inventory is misleading and should disabled.