SSHDroid is described as 'SSH server implementation for Android' and is an app. There are eight alternatives to SSHDroid for a variety of platforms, including Windows, Android, Linux, BSD and Cygwin apps. The best SSHDroid alternative is OpenSSH, which is both free and Open Source. Other great apps like SSHDroid are aShell, FreeSSHd, SwiFTP and MobaSSH.
OpenSSH is a free version of the SSH connectivity tools that technical users rely on. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks.
freeSSHd, like it's name says, is a free implementation of an SSH server. It provides strong encryption and authentication over insecure networks like Internet. Users can open remote console or even access their remote files thanks to buit-in SFTP server.
SwiFTP is an open-source FTP server that allows you to connect to your phone over wifi or cellular/3g to upload and download files. Any FTP client can be used.
MobaSSH allows you to run commands and transfer files on a remote Windows PC from any operating system (GNU/Linux, Unix, HP-UX, AIX, Windows, etc.) through a fully secured and encrypted network connection.
OpenSSH for Windows is a minimal installation of the Cygwin port of OpenSSH and related utilities to provide SSH and SCP services on the Windows platform.
zFTPServer Suite is a user friendly and easy to use FTP server. It offers all the standard FTP features, as well as support for SSL/TLS, transfer limits, real-time monitoring, virtual directories, and user groups.
Simple alternative to ssh (<5% SLOCC) written from scratch in Go, with support for PQC KEMs (Post-Quantum Cryptography Key-Encapsulation Mechanisms).
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