Internet Checksum: Simplified Step-by-Step Calculation Guide - αlphαrithms
File Checksum Tool - KRyLack Software
File checksum and hash calculator
What is a Checksum and How to Calculate a Checksum
File Checksum Calculator Download: Calculate MD5, SHA-1 and SHA-256 file hashes, and them compare them to an available checksum to see if they match, with this simple utility
How to Calculate File/Disk/Memory Checksums with HexEditorNeo
NMEA Checksum Calculator
NMEA sentences checksum calculator Download: Java-based program developed to help you calculate and verify the checksum for user-defined NMEA sentences used with GPS devices