If you're a Mac user who thrives on keyboard shortcuts and wants a lightweight tool for efficient window management, go with Rectangle. It's free and open source, making it perfect for those who prioritize an uncluttered workspace without the need for an account. However, if you seek advanced layouts, you may need to consider the paid Pro version.
On the other hand, if you're on Windows and need to reclaim disk space, choose WinDirStat. Its treemap feature effectively highlights large files, helping you make quick decisions about what to delete. It's also completely free and open source, but keep in mind the dated interface and slower initial scans on larger drives. If a modern look or cross-platform functionality is essential for you, then this tool might not be the best fit.