https://repl.it/perl6
If that stops working it means we moved it to https://repl.it/raku
Check it out. It's not actively supported but we hope to make it official soon
They're both 2019.03.1 so their "raku" is presumably raku in name only. (Eg doesn't support $*RAKU etc.) Be nice to see it upgraded to a real 2020 raku.
That looks like the previous version shipped with Rakudo Star. A new version was published a very short while ago, so perhaps they will update to 2020.01 soon enough.