Take a look at the 428+ ways you can write the classic C “Hello World” at the Hello World Collection.
There’s C#
Python
# Hello World in Python print "Hello World"
Good old QuickBASIC:
REM Hello World in QuickBASIC PRINT "Hello World!" END
XSLT
<?xml version="1.0" encoding="UTF-8"?>
<!-- Hello World in XSLT -->
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:text>Hello World!</xsl:text>
</xsl:template>
</xsl:stylesheet>
And even Commodore-64 assembler:
; Hello World for 6502 Assembler (C64)
ldy #0
beq in
loop:
jsr $ffd2
iny
in:
lda hello,y
bne loop
rts
hello: .tx "Hello World!"
.by 13,10,0
Do you know any languages that aren’t listed (non-proprietary of course).

Represent, dawg!
Mumps
; Hello World in Mumps-M
w !,”Hello World”