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Vote for TurboFTP SDK
TurboFTP SDK is a powerful ActiveX/.Net-ready component and offers a full set of FTP client functionality. Supports FTPS over SSL/TLS and SFTP. Supports blocking and non-blocking modes for calling methods. Supports on-the-fly data compression using MODE Z and firewalls. It comes with a built-in interface that provides a set of methods to decompress archives in multiple formats. Fully tested samples for major programming languages are included.