Personally, I would recommend using Visual Studio Code. It's a great and flexible IDE, and I especially find its global search very useful in MM5 addon development. If I don't know what piece of code is responsible for a piece of dialog, for example, I'll search for that string in VS Code, which will search the contents of all the files and show you every instance where that string is used.

Additionally, a tool I created called pack-mmip is pretty handy to quickly pack and test addons, which is available here: https://www.mediamonkey.com/forum/viewtopic.php?f=27&t=97536

And lastly, you can find several tips and tricks in the Developer API pinned post here. https://www.mediamonkey.com/forum/viewtopic.php?f=27&t=81285

Hi,
As MM is JS/HTML/CSS3/LESS based and DB calls are SQLite based you can use any tool you usually use with those.

Hi!

What are the recommended tools to develop addons for MM5?

Michael