HashCheck Shell Extension - File-integrity verification with CRC-32, MD5, SHA-1, SHA-2 and SHA-3, integrated into Windows...
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
RapidCRC Unicode - RapidCRC is an open source CRC/MD5/SHA hashing program.
Duplicate Cleaner - Duplicate Cleaner: the fastest and most popular tool for finding duplicate files. Over 1 million downloads: Get your copy now! Free and Pro versions available.
Md5Checker - Md5Checker is a free, faster, lightweight and easy-to-use tool to manage, calculate and verify MD5 checksum of multiple files/folders.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.