I love Kate! It’s so lightweight compared to other heavy ass IDEs. Just hook up an LSP and you’re good to go. I use it to manage 3 simultaneous HUGE projects, plus a configured build & run command for them, instead of 3 CLions. It’s just an awesome editor all around.
Self-plug: PENEfiles! (yes it’s an unfortunate name but I didn’t know back then cuz I am not a native speaker). Comes with a tag system and file ownership management. Supports direct link sharing, and the whole website can be visited without logging in. Here is a detailed intro and here is the source code.