Az

az is an esoteric programming language drawing inspiration from all-over.

a3 b5 i1 [ c0! ca+ cb+ ac0+! [? a3 s"Fizz".0] bd0+! [? b5 s"Buzz".0] cd|! [? i# d0] 10. c1i+ c101^ ? ]

Design

 * Each command is a single ascii character.
 * White space is optional and comments are ( in parens ).
 * There are 26 local variables named a-z.
 * Specifying a variable makes it current.
 * Commands always execute on the current variable.
 * The previous current variable is tracked too (like a 2-cell stack).
 * Integer literals are specified directly in base 10.
 * String literals are supplied as double-quoted strings.
 * Words of three or more letters are global named variables.
 * Functions are first-class, passed as integer references.
 * Zero is false. Non-zero is true.

Fibonacci
a0 b1 [ b# c32.0+ ac+ ba0+ cb0+ cd100-+\ ?]

Factorial
a1 b5 c0! [ ad0+ be0+ [ce+?da+] cb+ ?] a# 0

Beer
d { B"s" Aa1^! [?B0] } e { a"#A bottle$B of beer on the wall,".10. } f { a"#A bottle$B of beer.".10. } g { a"Take one down, pass it around,".10. } h { b"#A bottle$B" Aa0+! [? b"No bottles" a0] b. } i { a" of beer on the wall.".10.. } a99 [ a? d; e; f; g; c0!a+ d; h; i; ] 0

Brainfuck
( 64k source, 64k tape ) a32768@ ( read source to cell 26 ) a26 [ b,? a@0+ c1a+ ] ( tape pointer ) a16384 ( source pointer ) b26 ( bracket tracking ) x { EG^! [? a1F+ z] EH^! [? a0!F+ z] } [    b@c0+ ? (c = command) c (>) d62 ^! [? 1a+  z]     c (<) d60 ^! [? 0!a+ z]     c (+) d43 ^! [? 1a@+ z]     c (-) d45 ^! [? 0!a@+ z]    c (.) d46 ^! [? a@. z]    c  d44 ^! [? a@,  z]     c ([) d91 ^! [? f1 a@d0+! [? e1 b+@e0+ g91 h93 x; f ]] c (]) d93 ^! [? f1 a@d0+ [? e0! b+@e0+ g93 h91 x; f ]] c1b+ ]

External resources

 * Language Overview
 * Github Repo