aria2 is a utility for downloading files. The supported protocols are HTTP(S), FTP, BitTorrent, and Metalink. It has a powerful segmented downloading ability, downloading a file from multiple sources and multiple protocols and utilizing your download bandwidth to the maximum. It supports downloading a file from HTTP(S)/FTP and BitTorrent at the same time, while the data downloaded from HTTP(S)/FTP is uploaded to the BitTorrent swarm. Using Metalink's chunk checksums, aria2 automatically validates chunks of data while downloading a file like BitTorrent.
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.
gFTP is a free multithreaded file transfer client for *NIX based machines running X11R6 or later. It has text and GTK+ 1.2/2.x interfaces and supports the FTP, FTPS (control connection only), HTTP, HTTPS, FSP, and SSH protocols and has FTP and HTTP proxy server support. It supports UNIX, EPLF, Novell, MacOS, VMS, MVS, and NT (DOS) style directory listings, and has a bookmarks menu that allows you to quickly connect to remote sites. The code is fully internationalized and there are currently 45 translations available.
wzdftpd is designed to be a small, efficient, and highly modular/configurable FTP server for various platforms including Linux and Windows. The server is RFC compliant, multi-threaded and can be configured entirely online using SITE commands. You can write your own extensions to the server in your choice of language, extending on existing MySQL, PostgreSQL, SQLite, Tcl, Perl, PAM, and SFV plugins. Features include IPv6, TLS/SSL, UTF8, ACLs, VFS, events, scripting, plugins, job scheduler, bandwidth limitations, credits/sections, group administration, and customizable logging.
Net::FTPServer is a full-featured, secure, extensible, and highly configurable FTP server which can serve files from a standard file system or a relational database. It is written in Perl, which provides natural protection against buffer overflows. It has feature parity with popular C-based servers such as wu-ftpd. The server offers virtual hosts (IP-based and experimental IP-less). It is configurable in Perl, for both small Perl "hacks" in the configuration file all the way up to complete server "personalities". It supports the latest RFCs and Internet Drafts. Authentication may be done through /etc/passwd, PAM or an authentication plug-in. Resource limits are supported. The server may run standalone or from inetd. chroot() jails are supported along with sophisticated programmable access control rules. All aspects of server use and configuration are comprehensively documented in a manual running to some 50 pages.