SYNC Commander is a backup / synchronization tool supporting file system to file system, FTP to file system, file system to FTP copy, update and sync. 2 folders with 750+ sub-folders, 260000+ files and 14 GB+ total is sync by it everyday on my servers.
BuildSys exists to help multi-platform projects keep all their various build files in sync. It uses a single '.build' file to generate autoconf/automake .ac/.am files, visual studio 6 .dsp/.dsw files, vs.net .vcproj/.sln files, Dev-C++ .dev files, etc.