telnet client

Instantbird is a multi-protocol Instant Messaging client.

It is a execution of SQL statements database client utility.

A database client utility for execution of SQL statements on Access databases.

A best tool to detect a client's browser capabilities and settings.

Easily recover forgotten FTP passwords stored in any FTP client program.

A relational database client utility.

SIP Communicator - the Java VoIP and Instant Messaging client.

A scriptable SMTP e-mail client utility sends out pre-configured e-mail messages

msmtp is an SMTP client with a sendmail compatible interface.

mpop is a POP3 client: it retrieves mail from POP3 mailboxes.