FTP Client Engine for C/C++ 

The "FTP Client Engine for C/C++" (FCE4C) is a FTP client library component that provides control of the FTP client protocol. Upload, download, delete, list, and append files from your C/C++/C# application program. Royalty free distribution.
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FTP Client Engine for Delphi 

FTP client library component for Delphi that provides direct and simple control of the FTP client protocol from within a Delphi application program. Not dependant on support libraries. Supports all versions of Delphi. Multiple examples.
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FTP Client Engine for dBase 

FTP client library component for Visual dBASE that provides direct and simple control of the FTP client protocol from within a dBASE application program. Not dependant on support libraries. Supports all versions of Visual dBASE.
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FTP Client Engine for PowerBASIC 

FTP client library component for PowerBASIC that provides direct control of the FTP client protocol from within a PB application program. Transfer, delete, list, and append files. Not dependant on support libraries. Supports PB/CC, PB/DLL and PB/WIN
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Xceed FTP Library 

The Xceed FTP Library is a high-performance ActiveX control that allows developers to easily add FTP capabilities to their Windows or Web based applications and provides complete access to the feature rich and firewall friendly FTP protocol.
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