FindRepe finds (and optionally deletes) duplicated files by content, not name. It uses MD5 and SHA1 hashes to compare files. It can also compare just by file name.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
The options --nohide and --absolute-path were added. A problem in which files weren't deleted using --delete-auto was fixed. Java JDK classes are no longer used for reading zips. Files reached through a link are no longer ignored.
New options: --verbose-logger, --zip, --zip-only, and --jobs. Option --verbose has been implemented. Now the search can be done within zips and jars. The option --zip is still in alpha status because of a bug in the last "Apache Commons Compress" stable release that could cause an infinite loop on some buggy zips. The option --jobs is intended for development use only, but could improve performance in some cases.