SecureBlackbox (VCL) 

SecureBlackbox is a comprehensive component collection that adds S/MIME, SSL/TLS, SSH, PKI, SFTP, PGP support to your Windows or Linux application. This is VCL edition (for Delphi, C++Builder, Kylix).
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IglooFTP PRO 

Award winning FTP Client featuring simultaneous FTP / FXP sessions sessions with SSL support. Its main features are to be easy to use and intuitive when used by novice, but powerful and fully configurable in the hand of experienced users.
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ANPOP POP3 Component Build 

Easy- to-use and full-featured POP3 component enables your ASP, VB or other COM environment applications to retrieve email using the POP3 protocol. Supports IPv6 and many other advanced features. Featured Samples and full documentation included.
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SocketTools Secure Library Edition 

The SocketTools Secure Library Edition API has over 800 functions which can be used to develop applications that meet a wide range of needs. SocketTools covers it all, including uploading and downloading files, sending email and much more.
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FTP Voyager 

FTP Voyager lets you perform FTP tasks as if working locally in Windows Explorer. Connect to any FTP site, drag-n-drop files, synchronize, simultaneous transfers, auto-resume downloads, and more!
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Core FTP LE 

Core FTP LE - a free secure FTP Client with SSL/TLS, SSH/SFTP, IDN, ModeZ, fxp, dragdrop, transfer resume/retry, custom commands, URL parsing, FTP/HTTP Proxy, Socks 4/5 support, queue manager, .htaccess editing, chmod, and more!
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