From Wikipedia
Softdisk is a software and Internet company based in Shreveport, Louisiana. Founded in 1981, its original products were disk magazines. They were affiliated and partly owned by paper magazine Softalk at their founding, but survived its demise.
Softdisk has also published some standalone programs, including screensaver creator Screen Saver Studio.
They are probably most famous for being the former workplace of several of the founders of id Software, who worked on a short-lived game subscription product, Gamer's Edge. Gamer's Edge was a bi-monthly PC game disk started in 1990 by John Romero. The disk's developers were John Carmack, John Romero, and Adrian Carmack. Tom Hall, then a programmer who worked in the Apple II department of Softdisk, would come in at night to help with the game design. Lane Roathe was the editor.