Current dev of Mugenmonkey here - didn't expect to see the site posted here of all places. The site has been around since 2012, but I took over in 2014 and added the DS2, Bloodborne, and Dark Souls 3 planners. It's been popular among the enthusiast Dark Souls players for years, but has gotten some more mainstream attention since the DS3 planner was released.
Let me know if you have any questions about it.