qarmin (open-source developer / author of Czkawka)

Czkawka is an open-source file-cleanup utility authored and maintained by the GitHub user "qarmin". The project provides both a GUI and CLI application (the Windows GUI executable is commonly named czkawka_gui.exe) and is focused on helping users find and remove duplicate files, empty folders, large files, similar images, broken shortcuts, and other unnecessary filesystem clutter. The software is written in Rust and distributed via the project's GitHub repository and releases.

The project is community-driven rather than a commercial company; development, issue tracking, and releases are hosted on GitHub under the qarmin account. Czkawka has gained attention for being a fast, cross-platform open-source alternative to proprietary duplicate-file and system-cleanup tools. Development history and release notes are available in the repository, and users typically obtain the application binaries or build from source via GitHub.