The VOIDRUNNER'S CODEX is LIVE! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
I don't know about world maps, but the easiest mapper I've ever used was Dungeon Crafter (http://www.dungeoncrafter.com/). They're working on version 2 right now, and it looks pretty nice.