Esoteric Programming Languages
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ALPACA
Apple Befunge
BAK
Befunge
Blank
Brainf***
Brainfork
Bub
Bullfrog
Byte Syze
C-INTERCAL
Come Here
Doublef***
FALSE
Fromage
Funge
Gravity
INTERCAL
Kvikkalkul
l33t
Life
LOLA
Malbolge
Muriel
noit o' mnain worb
OISC
Oroogu
Orthagonal
Orthogonal
PATH
Q-BAL
Rail
RecurseMe
REDGREEN
reMorse
RUBE
Sansism
Shelta
SMETANA
SMITH
SORTA
Sorted!
Tamerlane
Threaded INTERCAL
TLWNN
TriINTERCAL
TURKEY BOMB
Unlambda
URISC
var'aq
Whitespace
Wierd
WireWorld
worb
Ypsilax
ZOWIE
A much more comprehensive list of esoteric programming languages can be found at
the Esolang wiki
.