The One Page Dungeon Compendium 2019 Edition is now on sale at Drive Thru RPG; https://www.drivethrurpg.com/product/305010/One-Page-Dungeon-Compendium-2019-Edition
This product provides single page dungeons for use with role-playing games like Dungeons & Dragons and Pathfinder.
I contributed a single page dungeon called the “Twisting Cavern”.
Submissions are now open for 2020, you can find the details on the One Page Dungeon homepage here; https://www.dungeoncontest.com/
Submissions close on July 1st, 2020.