lftpsearch is a set of Perl scripts that are searching for files and directories on FTP servers. There is the searcher, the indexer for getting the lists of all the files and directories at remote FTP servers, and the onliner for checking whether FTP servers are online. It supports "+" (or " ") and "*" in search queries, page splitting at search results, searching on online servers only, searching for files/directories only, searching for size limited files, caching, and Russian names. It also shows some statistics on servers (files/directories amount and total size). Initially, it was created to be used over LANs.
libcurl.mono is an object-oriented binding for the libcurl Internet client API. It supports rapid-development of powerful Internet clients in C# that can run within the mono runtime. With libcurl.mono, for example, you can develop FTP and HTTP clients without having to code down at the socket level. There are a number of sample applications to get you started.
fget is a commandline tool for mirroring remote files via FTP. It is based upon the included FTP client library, whose API is designed to resemble the normal Unix API for accessing files and directories. This interface should make it very easy to integrate FTP support into other applications.
Libopennet allows developers to open_net() files or URLs alike, and get a file descriptor back that they can use to read data from. It supports HTTP (read-only) and FTP (read or write). It also comes with read_net() to do a forceful read(), and lseek_net() for calling lseek on the socket/file.
libssh is a C library to access SSH services from a program. It can remotely execute programs, transfer files, and serve as a secure and transparent tunnel for remote programs. Its Secure FTP implementation can play with remote files easily, without third-party programs other than libcrypto (from OpenSSL) or libgcrypt.
linux-ftdp-ssl is the netkit ftp server with encryption support. ftpd-ssl replaces normal ftpd using SSL authentication and encryption. It operates together with normal ftp. It checks if the other side is also talking SSL, if not it falls back to normal ftp protocol. Advantages over normal ftp(d) are that your passwords and the data you send will not go in cleartext over the line, and nobody can get it with tcpdump or similar tools.
mimic is a server that mimics Internet servers. It includes imitators for ftpd and telnetd, and can be extended with scripting to support other types of imitation. Users will believe they are connected to authentic services (such as ftpd or telnetd) but will never be able to log in. Everything that they type is logged. In addition, scripting new imitator services is simple. The program includes a one-liner example of a fully-functional echo server. The project's goal is to create a script for imitating most, if not all, popular Internet services.