Gopherus is a free, multiplatform, console-mode gopher client available for DOS, Linux and Windows. It provides a classic text interface to the gopherspace. Altough primarily targeted for DOS, ports to Windows and Linux are also available. These use SDL2 to emulate a pseudo terminal.
AWGG comes from Advanced Wget GUI. AWGG is a lightweight multiplatform and multilanguage download manager, basically a wget frontend and other tools like aria2, curl, youtube-dl and axel. AWGG is written in Free Pascal , using CodeTyphon and Lazarus IDE.
FtpMup is a C++ multiplatform library that implements a FTP client. It is based on DanubioNG framework. You can find also a simple executable that show how to use this library.
Web Integrator is a Multiplatform web based Integration/replication solution with support for multiple data sources. Web Integrator allows connecting of diverse data sources/consumers located on different platforms and remote locations.
Free Open FTP Face is a graphical (GTK+) FTP client written in Python. Its emphasis is on simplicity and convenience. It is multiplatform, easy to use, has a built in text viewer, image viewer, audio player, checksums, and one-click (de)compression.