I need a HTML IDE, which builds a full project (take Coffeecup Editor as an example) but for free.
My favorite editor is Visual Studio Code
It is free and open-source (MIT License)
I use Brackets. It has autocomplete for some languages and you can add functionality with plugins. You can get it for free on brackets.io and its opensource. Before I switched to the Jetbrains tools, I used Brackets a lot. It has an active community, syntax highlighting and the posibillity to be extended eith plugins, like I already said.