First album that comes to mind is The United States of America self-titled.
Another really solid one is Cromagnon for the level of weirdness they brought to the table. Theories that these gentlemen are The Residents are out there, but I don't believe them anymore since it doesn't match up geographically.
Negativa has members of Gorguts in it and only released a 3 track EP after one of their band members died

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Not sure if they're done yet, but Lumbar makes some incredible ****. Interviews I've read made it sound like it was a one time thing.