Is it free?
Yes. Kamembert is free, with no sign-up.
Which platforms?
It is a native desktop app built in Rust on a portable core, so the same app can run across platforms. See the download page for the current builds.
Will it delete anything on its own?
No. Kamembert only ever shows you what is on disk. You choose what to remove, and it goes to the Recycle Bin.
Where does it store its data?
Recent folders, snapshots, and settings live in a folder on your machine. For versioned projects, the record lives in a hidden .kam folder beside the project itself.
Which engines does Projects recognize?
Unity, Unreal, Godot, GameMaker, and Construct 2 and 3 today. Other projects can carry a small version.ini that Kamembert will read.