For years, Dungeon A Day posted daily dungeon encounters by Monte Cook for Dungeons & Dragons 3.5 OGL. It was a massive dungeon. Eventually, he brought in Super Genius Games to keep the site running and complete the Dragon's Delve mega dungeon. Afterwrads, Super Genius continued with smaller dungeons, and added the Pathfinder rules along the way.
Sadly, the site was forced to close to new subscribers last year. Fortunately, Super Genius received enough interest to start a new Kickstarter campign to make the original material available to newcomers. They hope to gain enough funding to add to the original material, and more.
Regular readers may remember that I was one of the site's cartographers near the end of Dragon's Delve and other adventures. If the kickstarter works, I may get the opportunity to do more of that in the future, plus something more...