JSch

JSch is a pure Java implementation of the Secure Shell protocol (SSH). It allows Java applications to connect to SSH servers and perform various operations, such as executing remote commands, transferring files using SFTP, and tunneling network traffic. Developed by JCraft, JSch is a widely used library for adding SSH capabilities to Java projects.

The library provides a set of classes that abstract the complexities of the SSH protocol, making it easier for developers to integrate SSH functionality. Key features include support for SSHv1 and SSHv2 protocols, various authentication methods like password, public key, and keyboard-interactive, and support for common ciphers and MAC algorithms. It also offers an API for handling SSH channel requests, which are used for various purposes like forwarding ports or executing commands.

JSch is often employed in automated tasks, system administration tools, and applications that require secure communication with remote servers. Its ease of use and comprehensive feature set have made it a popular choice for Java developers needing to interact with SSH. The library is typically included as a dependency in a Java project's build system.