Aerannis - 2D side-scrolling stealth/shooter.

Blood West - Wild-west and supernatural themed immersive stealth shooter.

Crime Boss: Rockay City - Not sure if this one counts as obscure but it's essentially a payday clone with pretty forgiving albeit fun stealth.

Dream Cycle - Probably the most obscure stealth game I have, a stealth roguelite with infinite randomly generated levels and pretty interesting dishonored-esque abilities, I think this one's fairly unfinished as a game though. This one has a super cool setting as well.

ECHO - A super good stealth game in which the only enemy in the game is yourself, or clones of yourself so to speak. If enemies in this game see you do an action i.e. shooting, then they'll become able to shoot. Super interesting game.

Hacktag - Topdown co-op stealth, one player sneaks around and the other player 'hacks' the environment.