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To be fair it's the actual releases that are in a single file.
Development evidently happens in the traditional sense with the project in a nicely defined tree.
The build process looks pretty gnarly, but it works! https://github.com/vrana/adminer/blob/master/compile.php
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JetBrains
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Another in this vein is "pgweb" for PostgreSQL, just need a binary to run its web interface.
https://github.com/sosedoff/pgweb
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I do similar things with Elixir scripts, though commonly I still turn to PHP because there is some single file library that does what I want with a lot less ceremony than the Java variety would require.
There's also PsySH, https://psysh.org/, for being something other than a Common Lisp or BEAM interface it's a very nice REPL. Besides Picolisp and iex it's the interactive programming environment I use the most.