Czkawka is fast and easy to use app to find and remove unnecesarry files from your PC.

Features:
Written in memory safe Rust
Amazingly fast - due to using more or less advanced algorithms and multithreading
Free, Open Source without ads
Multiplatform - works on Linux, Windows and macOS
Cache support - second and further scans should be a lot of faster than the first
CLI frontend - for easy automation
GUI frontend - uses modern GTK 3 and looks similar to FSlint
Rich search option - allows setting absolute included and excluded directories, set of allowed file extensions or excluded items with the * wildcard
Multiple tools to use:
- Duplicates - Finds duplicates basing on file name, size, hash, first 1 MB of hash
- Empty Folders - Finds empty folders with the help of an advanced algorithm
- Big Files - Finds the provided number of the biggest files in given location
- Empty Files - Looks for empty files across the drive
- Temporary Files - Finds temporary files
- Similar Images - Finds images which are not exactly the same (different resolution, watermarks)
- Zeroed Files - Finds files which are filled with zeros (usually corrupted)
- Same Music - Searches for music with same artist, album etc.
- Invalid Symbolic Links - Shows symbolic links which points to non-existent files/directories
- Broken Files - Finds files with an invalid extension or that are corrupted