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.
GNU Wget is a utility for noninteractive download of files from the Web. It supports HTTP and FTP protocols, as well as retrieval through HTTP proxies. It can follow HTML links, download many pages, and convert the links for local viewing. It can also mirror FTP hierarchies or only those files that have changed. Wget has been designed for robustness over slow network connections; if a download fails due to a network problem, it will keep retrying until the whole file has been retrieved.
gnu.hylafax implements the HylaFAX client network protocol in pure Java. With it, Java applications can access a HylaFAX server in various ways, such as queueing FAX jobs, checking server/job status, and retrieving FAX files. The gnu.hylafax distribution also includes gnu.inet.ftp, a pure Java implementation of FTP client protocol (RFC0959).
GTransferManager (gtm) allows the user to retrieve multiple files from the Web. These files can be retrieved in multiple parts, and each part retrieved on a separate session when the user is connected to the Internet. This is most useful to users with dialup connections. The program performs these tasks using wget as its backend.
Guiftp is a simple FTP client using the GTK+ toolkit. It can actually connect to a remote host, and download and upload files and directories. It supports interrupted transfer and bookmarks, and you can do the usual operations like erase files and directories, create directories, and erase directories recursively on both the local and the remote computer.