Visual Map-Making:
FeedTheMultiverse's MasterlistAzgaar's Fantasy Map Generator (a favorite!: free)
Worldographer (freemium)
D20 Pro's World Engine(freemium)
World-machine (freemium)
RedBlobGames' Mapgen 4 (free)
Superobot1's MapGen (free)
Language
Quickly build a language:
Vulgarlang (freemium)Widmann's Language Creator (free)
learn about English & build off of it:
Conlang Official WebsiteZompist's Conlang Kit (free)
Wikipedia: English Phonology
Wikipedia: IPA chart
Wikipedia: Vowels
Wikipedia: Consonants
Font formatter
Dougrich's Conscripter (freemium)Generators/Worldbuilding focused Websites:
Rangen's MasterlistImagineForest's Masterlist
Roll For Fantasy (free)
Legendkeeper (freemium - trial)
Dungeon draft (paid)
Inkcarnate(freemium)
WorldAnvil (freemium)