Matteus interviews Rob Conley, writer of the "Bat in the Attic" blog. They discuss sandbox campaigns, tools for hexcrawling, and how this is perfect for Greyhawk.
Bat in the Attic blog: https://batintheattic.blogspot.com/?m=1
"How to Make a Fantasy Sandbox" on DMs Guild: https://www.drivethrurpg.com/en/product/470041/How-to-Make-a-Fantasy-Sandbox
"Zoomable" greyhawk hex map: https://zoomhub.net/6Xn0O