lftp is a sophisticated command line based file transfer program. Supported protocols include FTP, HTTP, SFTP, and FISH. It has a multithreaded design allowing you to issue and execute multiple commands simultaneously or in the background. It also features mirroring capabilities and will reconnect and continue transfers in the event of a disconnection. Also, if you quit the program while transfers are still in progress, it will switch to nohup mode and finish the transfers in the background. Additional protocols supported: FTP over HTTP proxy, HTTPS and FTP over SSL, BitTorrent protocol. IPv6 is fully supported. There are lots of tunable parameters, including rate limitation, number of connections limitation and more.
RVM is an archive manager that uses rsync to manage backups of multiple clients across multiple logical partitions (vaults). It has some features that some other rsync-based backup schemes lack, such as being written in C++, needing no scripts or other programs than rsync and any binaries on which rsync depends (such as SSH), the ability to manage multiple instances of rsync connections to separate clients in parallel, the ability to use multiple logical partitions (vaults) in a configurable fashion for purporses of redundancy and added reliability, and the use of hard links for files that have not changed from one archive to the next.
Rsyncrypto allows you to encrypt a file or a directory structure such that they can later be synchronized to another machine using rsync. This means that local changes to the plain text file result in local changes to the cipher text file. rsyncrypto compresses the plain text file prior to encrypting it with gzip using the "rsyncable" patch, which is available from the rsync sources.
changedfiles is a framework for filesystem replication, security monitoring, and/or automatic file transformations--essentially any application where you'd poll files or directories and either do something to them or send them somewhere else (or both). The difference is that the kernel tells you when they change instead of you having to poll. It's an easy real time FTP push mirror to one or multiple sites. It's also a full fledged MySQL client, so you can do realtime database operations (for example, batch imports). It consists of two parts: a kernel module (works with Linux kernel version 2.4) which reports to a device whenever a file on the filesystem changes, and a daemon which runs in user space and can be configured to do almost any action when a change to a file matching the one of the patterns it looks for is reported. The kernel module is SMP safe and has been tested on Intel, PowerPC, and Alpha.
ECMerge compares and merges files and folders, side-by-side or 3-way. It provides syntax coloring for C/C++, Java, HTML, ASP, PHP, and many other programming languages. It can save your work at an intermediate state and restart it later. It can generate Unix patches and XML/HTML reports between files. A shell extension is provided under Windows. PDF, Word, and ZIP documents can be compared using converters.