File comparison, synchronization, and merge utilities, from the humble Unix "cmp" and "diff" to more visual and interactive utilities. These show how two files, especially text files, are different, and often what needs to be changed to make them identical - which lines need to be inserted, deleted, changed, or moved. This helps to join two versions of a document, or to see what changed between versions.
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Advanced CheckSum Verifier
Verifies the integrity of files, by using the CRC32 or MD5 checksum calculation algorithms. Checksums may be used for revealing the damaged files or compare two files for identity. [Windows 95/98/Me/NT/2000/XP].
Command line utility to diff/compare two CSV files with the possibility to select the separator. Written in Perl, licensed under the GNU GPL.
Darwin Open Systems
Including Java diff source code, idiff, mgdiff, and spiff Unix tar.gz downloads.
File Replication Pro, is a secure TCP/IP based replication solution, automatic real-time or scheduled replication across LANs, WANs, Internet and firewalls. [Win 95/98/ME/NT/2000/UNIX/LINUX/MAC/NETWARE]
Free file checksum generation and verification utility. Supports .MD5 and .SFV file formats.
Shareware text file compare/smart-merge tool with a 1.2 Java/Swing GUI. For all Java-enabled platforms.
Compares and merges 2 or 3 files or directories. The file diff shows changes within each line. For Unix and for Windows. Source available under GPL.
WordDocDiff compares two MSWord/Text files side by side. Complements FindInFilesX and CompareFilesX.
File synchronization tool that allows two replicas of a collection of files. Directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other. [Unix / Windows]
Generic Diff Format
Specification of GDIFF, a generic file format for representing the differences between two files, from Marimba to the W3C. (September 01, 1997)