wolfSSL provides many products, services, and support for almost all things TLS and embedded. One of these products provided by wolfSSL is wolfSSH - an SSHv2 server library!
wolfSSH is wolfSSL's own open-source and dual-licensed implementation of the SSHv2 protocol. It's a server library written in ANSI C and targeted for embedded/RTOS/resource-constrained environments. It's fast, has a small code size, and an extensive feature set. This feature set includes items such as SCP support, SFTP support, PEM and DER certificate support, and also hardware cryptography for supported devices! This comes from wolfSSH's leverage of the wolfCrypt crypto engine for its cryptographic operations.
wolfSSH can be downloaded from the wolfSSL download page (located here: https://www.wolfssl.com/download/), or from a git-clone of the wolfSSH GitHub repository (located here: https://github.com/wolfssl/wolfssh.git).
Additionally, wolfSSL provides support and maintenance for all of its products, wolfSSH included. More information on wolfSSH support and maintenance can be found on the wolfSSL support page, located here: https://www.wolfssl.com/products/support-and-maintenance/.
For more information on wolfSSH or related products, please contact facts@wolfssl.com.