vertico

I use it at my current job in which I work in a large C++ codebase. I formerly used CLion. Whether Emacs is an IDE or not depends how you define IDE. I use Eglot [0] for LSP integration; this gives me IDE-like features like "jump-to-definition", syntax error highlights, warnings, etc. and integrates with company-mode [1] for code completion. This handles most of my needs for writing code. As for other things like a file tree, I've found that the built in `project-find-file` command combined with `vertico` [2] and `orderless` [3] makes finding files and navigating around projects easier; that pair behaves similarly to CMD+P in Sublime Text or VS Code. There are file tree packages out there, but I've found that I don't really need a file tree in practice and that I prefer navigating around projects with fuzzy file search and grep. [0] https