AbsoluteTelnet

AbsoluteTelnet is a software terminal client for Windows that implements Telnet, SSH 1 and 2, SFTP, TAPI Dialup and direct COM port connections. It is commercial software, originally released in 1999 and is still in regular development by Brian Pence of Celestial Software.

Some features of AbsoluteTelnet:

• Post quantum key exchange including mlkem768x25519-sha256 and sntrup761x25519-sha512
• Support for external authentication agents (pageant, openssh, 1Password, bitwarden)
• Emulates VT52, VT100, VT220, VT320, ANSI, Xterm, QNX, SCO-ANSI, ANSIBBS, and WYSE60
• Password, Public-key, keyboard-interactive, Smartcard and GSSAPI authentication support
• Support Triple DES, TWOFISH, BLOWFISH, AES, ARCFOUR, CAST128 ciphers in CBC or CTR mode as well as AEAD ciphers such as AES/GCM.
• Tabbed interface for multiple concurrent connections (Dockable)
• Scripting support using VBScript
• Unicode 5.0 support, including bidirectional text, surrogates, combining characters, etc...
• Passthru printing
• IPv6 support.
• IDNA support
• Localized into 8 languages (English, German, French, Portuguese, Chinese, Russian, Norwegian and Hungarian)
• Pocket PC support
• XMODEM, YMODEM, and ZMODEM file transfer for all terminal connections
• SSH File Transfer Protocol for ssh2 connections only

• Comparison of SSH clients

• Centrify article on Single Sign On with Absolutetelnet

• Official AbsoluteTelnet website
• Full list of supported algorithms