Hashbrown
Hashbrown is a free and open source simple graphical tool for generating, comparing and verifying MD5, SHA-1 and SHA-256 hashes
ExifCleaner is a free and open source, multi-platform desktop program for cleaning metadata from images, videos, PDFs and other files
Metadata Cleaner is a free and open source utility for view and clean metadata in files for Linux
GSmartControl is a free and open source, multi-platform tool for checking the health of a hard disk and SSD
Redshift Control Plasma – free and open source applet for automatically adjusting color temperature of screen depending on time of day in KDE Plasma