Minimized BF
Minimized BF is brainfuck with only 4 commands +>[], created by User:None1. Despite the fact that it has only 4 commands, it's still very powerful and almost Turing complete.
Memory
This esolang runs on a circular tape with 256 8 bit cells, overflow and underflow wraps around.
Commands
Minimized BF doesn't need the - command because 255 + commands is equivalent to one - command. It doesn't need the < command, because 255 < commands is equivalent to one < command.
I/O
Unlike brainfuck, this esolang has no commands for I/O, but it still has I/O. Before a program runs, the input is read from a file and into the tape clockwise as a C-Style string, starting from the pointer. After the program terminates, the tape starting from pointer's initial position clockwise as a C-Style string is written into the output file.
Example Programs
Hello World (unoptimized)
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Cat Program
Truth Machine
See the page Ruck for a Truth Machine in Minimized BF.