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Here: Script Inspector 3 | Visual Scripting | Unity Asset Store
Script Inspector 3 literally changed my life. I haven’t used or wanted any other Unity code editor since I installed it. When I create a new project, Si3 is the one asset I always add first. It’s so fast and so good! I don’t understand how people can stand to use Unity without it.
(I believe Unity’s intent is that you use Visual Studio, but I much prefer to just edit my code right within Unity, thank you very much.)
Why don’t you just use Visual Studio Community 2019 that is cut for Unity 2019? Do not install it from the Unity installer though, download it from the Microsoft site.
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yes i went for VS… not that bad, my compilation time is much shorter than it was, is it due to VS or Unity2019 ?
because it costs 40 dollars
Both, maybe? 
What do you like about it over VS?
Unless you’re a hobbyist uploading your games to Itch.io you’ll spend far more than that on just your first game.
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It turns Unity into an integrated development environment. I click on a script, and there’s the source, right in the Inspector. I double-click it and it snaps open. Like, instantly. You can configure it to either recompile right away as soon as you save, or you can set it to wait until you double-save or run. It enhances the Console with a contextual menu that lets you jump to any place in the call stack of a method. It enhances the inspector for events with a little button that lets you jump to the event handler. It also has better Intellisense for things like MonoBehaviour magic methods. But really the speed and the integration are the killer features for me. MonoDevelop was a pig. VS is slightly better, but still pretty piggy compared to Si3.
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What software compiles it?
Why not directly from the Hub?
Unity. None of the external editors (including Visual Studio) use their own compilers. When you switch back to Unity from the editor you’re working in the little blip in performance is Unity recompiling everything that changed.
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In the past, I don’t know if it’s still true, you couldn’t choose where to install VS when you selected it in the modules to add to the Unity version you want to install. A big no-no for me. 