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.
Features
Some features of AbsoluteTelnet:
Post quantum key exchange including mlkem768x25519-sha256 and sntrup761x25519-sha512
Support for external authentication agents (pageant, openssh, 1Password, bitwarden)