Once you have all the albums you want by Nine Inch Nails, Ministry, KMFDM, and Skinny Puppy, what’s worth checking out? Here are a few suggestions.
English artist Raymond Watts was an occasional member of KMFDM for most of his career so far. His own project, Pig, sometimes bares similarities to KMFDM, but it often includes orchestral elements, horns, and a layer of filth. I’d say the rockiest Pig albums are Sinsation and Wrecked, both of which came out in the mid-nineties. *Slightly NSFW lyrics*
Chicago-based act Sister Machine Gun is another no brainer for KMFDM fans. I think you’re safe with any album, really, but my favourites are 1994’s The Torture Technique and 1995’s Burn.
Here are two arguments for checking out Pigface’s second album, 1992’s Fook: it features familiar figures (including members of KMFDM, Ministry, and Skinny Puppy) showcasing their talents in a different setting than you’re used to, and it also features some more obscure artists, some of whom you might like enough here to look into further. *Slightly NSFW lyrics*
If you’re into the more electro side of the genre, look into Canadian act Front Line Assembly, who are led by a former Skinny Puppy collaborater. 1999’s Implode is a fine place to start.
No industrial/EBM collection is complete without Belgian band Front 242’s 1988 classic, Front by Front.
If you like the heavy, it’s recommended that you pick up Godflesh’s debut full length, 1989’s Streetcleaner, immediately.