Untested Fortran

fortran/helloworld.f

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+program hello
+    print *, "Hello World!"
+end program

haskell/helloworld.hs

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+main = putStrLn "Hello World!"

kotlin/helloworld.kt

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+fun main(args : Array<String>) {
+    println("Hello World!")
+}

perl/helloworld.pl

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+print "Hello World!\n";

ruby/helloworld.rb

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+puts 'Hello World!'

swift/helloworld.swift

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+print("Hello World!")