Brainfuck is an awesome language with a wide range of community-made tools.
My work regarding Brainfuck:
Izmit3 (v1 & v2) - C to Brainfuck compiler made by me in Perl, maybe as a challenge, maybe for fun.
Brainfuck experiments - Repository containing a few Brainfuck experiments.
Two Brianfuck Assemblers - As the name suggests, I have made a few Brainfuck assemblers.
There is also:
Brainfuck compiler in Brainfuck by Matslina.
A few interpreters and Brainfuck to everything converters made by Rdebath
The fastest Brainfuck interpreter known to me, Tritium, made by Rdebath.
Brainfuck experiments by Daniel B. Cristofani
"Industrial-grade" Brainfuck compiler by Wilfred