yaSSH

The yaSSH project is an exceptional implementation of SSH that boasts dual-licensing. This implementation comprises an SSH client, a client library, a server, and a server library. One of the project's primary areas of focus is speed, making it ideal for scenarios where quick transfers are paramount. Furthermore, their implementation is extremely memory-efficient, has an accessible API, is portable across platforms, and is perfect for embedded systems.

In the project's latest release, they have added client transport support and provided an initial client authentication feature. These updates are a significant step forward for the project, making it even more appealing to potential users. Overall, the yaSSH project is an excellent implementation of SSH that could prove to be a valuable tool for those looking for a fast and reliable file transfer solution.