Google Colaboratory is technically an IDE for Ubuntu. Although it's more of a scripting environment than a "real" IDE :) I like to combine Colab (for compilation) with github.dev (for source editing), creating a flexible cloud computing environment with cloud storage. I just wish github.dev was released before - not after - I created Swift-Colab.
Visual studio code has an official swift plug-in. That’s probably your best bet.
Yeah the work the SSWG has done on the VS Code Plug-in is incredible. I find myself using VS Code more and falling back to Xcode for any IB or lower level profiling
Since Jetbrains has now discontinued the official Swift plugin for CLion, we have one great option less.
Coming from CLion, I can't share your love of VSCode with Swift. With CLion, you opened an SPM package just like in Xcode and everything was setup automatically, including build and run configurations. This doesn't seem to work in VScode or am I using it wrongly?
That's pretty much the experience you get using the SSWG / @adam-fowler maintained VSCode Swift plugin, yeap. More info here: Swift.org - Swift Extension for Visual Studio Code
I'm also sad about CLion discontinuing support, but the Code plugin has come a very long way! Just popping up a project immediately opened up everything nicely, including discovering and running tests etc:
And we can collaborate on improving the plugin which is nice and good for long term improvements 
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i wish the autoindentation worked on vscode. i have it set to “full”, but it doesn’t ever seem to do anything.