Here we have free software downloads you will find useful.

WS FTP LE -- 691KB.
A Windows 95/98/NT/2000/XP FTP Client

Vicomsoft's Mac FTP Client -- 2.3MB
A Mac OS 7/8/9 FTP Client

Grub's Secure FTP Client -- 2.0MB
A Mac OS X 10/10.1 FTP Client