SSH
ConnectBot is an open-source Secure Shell client for the Android operating system. It lets users securely log in remotely to servers that run a secure shell daemon. This allows the user to enter commands from their Android device and have the commands run on the remote server instead of the local android device. It uses the standard encryption used by SSH2 to keep any commands and data that are transmitted from being eavesdropped by any potential listeners across the network.