JavaScript, HTML, BF

<!-- // > to fix previous comment delim /* ++++++++++[>+++++++>++++++++++++ >++++++++++>+++++++++++>+++>+<<<<<<-]>++++ .>---.--.+.>>>++.<<---.>.+.<<.>+++++++.--- .>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++. -------.++.>-------.<++.>+++++++.>>. */ alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)

Make sure your BF interpreter supports pointer wrapping.

JavaScript, HTML, BF

<!-- // > to fix previous comment delim /* ++++++++++[>+++++++>++++++++++++ >++++++++++>+++++++++++>+++>+<<<<<<-]>++++ .>---.--.+.>>>++.<<---.>.+.<<.>+++++++.--- .>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++. -------.++.>-------.<++.>+++++++.>>. */ alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)

Make sure your BF interpreter supports pointer wrapping.

JavaScript, HTML, BF

<!-- // ++ to fix previous minus minus /* ++++++++++[>+++++++>++++++++++++ >++++++++++>+++++++++++>+++>+<<<<<<-]>++++ .>---.--.+.>>>++.<<---.>.+.<<.>+++++++.--- .>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++. -------.++.>-------.<++.>+++++++.>>. */ alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)

JavaScript, HTML, BF

<!-- // > to fix previous comment delim /* ++++++++++[>+++++++>++++++++++++ >++++++++++>+++++++++++>+++>+<<<<<<-]>++++ .>---.--.+.>>>++.<<---.>.+.<<.>+++++++.--- .>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++. -------.++.>-------.<++.>+++++++.>>. */ alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)

Make sure your BF interpreter supports pointer wrapping.

JavaScript, HTML, BF

<!-- // ++++++++++[>+++++++>++++++++++++>++++++++++>+++++++++++>+++>+<<<<<<-]>++++.>---.--.+.>>>++.<<---.>.+.<<.>+++++++.---.>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++.-------.++.>-------.<++.>+++++++.>>. alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)

JavaScript, HTML, BF

<!-- // ++ to fix previous minus minus /* ++++++++++[>+++++++>++++++++++++ >++++++++++>+++++++++++>+++>+<<<<<<-]>++++ .>---.--.+.>>>++.<<---.>.+.<<.>+++++++.--- .>+++.>.<<<<<++++[>--<-]>.++++.>>>>.<<+++. -------.++.>-------.<++.>+++++++.>>. */ alert('Just another JavaScript hacker') // --> Just another HTML hacker 

Relies on the fact that most JS implementations ignore <!--.

BF code shamelessly stolen from @Tyzoid, all credit to him :-)