Maze Rats was self published by Ben from Questing Beast.
Into the Odd was done by Chris McDowall of Electric Bastionland fame.
Someone already mentioned John Harper who I think is a graphic designer in his other life. So that means World of Dungeons, Lasers & Feelings, Lady Blackbird, Agon, Blades in the Dark, Ghost/Echo, Ghost Lines, The Mustang.
Index Card RPG by Brandish Gilhelm (they go by Runehammer I believe).
Dave Cox who did A Rasp of Sand.
I don’t think Esoteric Enterprises is self published but Emmy Allen wrote and laid it out on her own.
I probably have more, but that’s all I can think of.