Python (decent standard library) - It's pretty much everywhere. There's so many hidden gems in that standard library (difflib, argparse, shlex, subprocess, cmd)
C#/F# (.NET)
C# feels so productive because of how much is available in .NET Core, and F# gets to tag along and get it all for free too. With C# you can compile executables down to bundle the runtime and strip it down so your executables are in the 15 MiB range. If you have dotnet installed, you can run F# as scripts.