Brainstuck
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Brainstuck is a variation of Brainfuck, with a stack instead of a tape.
Commands
The commands are:
Token  Command 

+

Increments the top value of the stack. 


Decrements the top value of the stack. 
.

Pops the top value of the stack, and outputs it. 
,

Pushes a byte from stdin on the stack. 
0

Pushes 0 onto the stack. 
:

Pops the top value of the stack, and pushes the value at a depth of that depth into the stack onto the stack. 
[

Pops the top value of the stack, and if that value is 0, jumps to the opcode after the corresponding ] .

]

Jumps to the corresponding [ .

Examples
Infinite cat program
0+[,0:.+]
Forth codes
It is possible to convert into Forth codes by:
+ 1+ 255 AND  1 255 AND 0 0 : PICK , KEY . EMIT [ BEGIN WHILE ] REPEAT
Some other commands in Forth can be also using the Brainstuck codes:
DUP 0: OVER 0+: THEN 0] 0 * 0:[0:] DROP [0:[0:]]