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Perl and PHP are also open source languages were people don't use repls often. Java and C# don't have repls either. I don't think everyone has ever thought they needed a REPL for any reasonable definition of everyone.

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C# from Microsoft doesn't have a REPL, but C# with Mono does: http://www.mono-project.com/CsharpRepl

re.pl is invaluable to the modern Perl programmer (as is cpanm).

I don't think it's invaluable to the modern perl developer. I don't know whether I disagree with your concept of invaluable or your concept of modern perl developer or both. I tried searching "perl repl" on twitter and google to see if there's much talk about it and there doesn't seem to be much. AFAICT it just isn't a big part of the perl workflow, modern or not. Most of the people who like it could manage just fine without it. I don't think the same is the case with python or ruby. Some pythonistas and rubyists use the repl for everything.

I use small files instead of repls most of the time. There's no program that's too short to be stored in a file.

The best place to search (for Perl REPL's) is on CPAN - https://metacpan.org/search?q=repl

The current grandaddy is Devel::REPL - https://metacpan.org/release/Devel-REPL

The new kid on the block is Reply - https://metacpan.org/release/Reply

PS. I do find using a Perl REPL invaluable for me.

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