A neat little table showing the frequency of letters in English and the frequency of the next letters after them — good for crossword puzzles, word games, and inventing new nonsense words that sound plausible.
All Things Linguistic
datarep:Letter and next-letter frequencies in English
by Udzu
The best part of this chart is the pseudowords it generates:
Bastrabot
Forliatitive
Wasions
Felogy
Sonsih
Fourn
Meembege
Prouning
Nown
Abrip
Dithely
Raliket
Ascoult
Quarm
Winferlifterand
Uniso
Hise
Nuouish
Guncelawits
Rectere
Doesium
Whigand
Gamplato
Onal
Foriticent
Thed
Euwit
Gentran
Loubing.