AFD is a program to automatically distribute files either locally or to remote hosts. The files are distributed by using FTP or SMTP, and can be sent in parallel and with priority. It provides a GUI to monitor and control the distribution and extensive logging of all activities.
BetaFTPD is a single-threaded FTP daemon. The single-threadedness makes it faster than most other FTP daemons (contrary to common belief), and makes it extremely light on memory. Although it lacks a few functions (which you probably won't miss), the current version is very small and has a decent amount of functionality. BetaFTPD is built on the concept of heavy code reuse, which should hopefully make it easier for other programmers to contribute.
bftpd is a very configurable Linux FTP server which can do chroot without special configuration or directory preparation. It will work out-of-the-box with almost no configuration required, and works on all Unix variants tested. Most FTP commands are supported, and user authentication is done via passwd/shadow or PAM. tar/gzip on-the-fly is supported.
curl and libcurl is a tool for transferring files using URL syntax. It supports HTTP, HTTPS, FTP, FTPS, SCP, SFTP, TFTP, DICT, TELNET, LDAP, POP3, IMAP, SMTP, RTSP, RTMP, and FILE, as well as HTTP-post, HTTP-put, cookies, FTP upload, resumed transfers, passwords, port numbers, SSL certificates, Kerberos, and proxies. It is powered by libcurl, the client-side URL transfer library. There are bindings to libcurl for about 40 languages and environments.
DeleGate is a multi-purpose application level gateway or proxy server that mediates communication of various protocols, applying cache and conversion for mediated data, controlling access from clients, and routing toward servers. It translates protocols between clients and servers, converting between IPv4 and IPv6, applying SSL (TLS) to arbitrary protocols, merging several servers into a single server view with aliasing and filtering. It can be used as a simple origin server for some protocols (HTTP, FTP, and NNTP).
The file check daemon monitors files according to rules defined in configuration files. When a file is considered stable (due to its age, presence of a flag file, etc.) then it gets copied to a new location. Rotating backups of the destination file can be made and owner, group and permissions can be specified for the destination. Some examples of where this utility has been found to be useful are: Moving files out of an incoming FTP directory in a timely manner. Moving files uploaded to a web server into directories with different user/group. This lets the administrator run the web server as a non-root user and accept uploads using web server based authentication and then move the files to a more secure area after the transfer. The details of how to determine whether a file is stable and what to do with it once it is are defined in a "Filespec" configuration file. There is a separate filespec for each file that will be monitored which means that each file can have unique behavior associated with it.