XMouse Remote Mouse & Keyboard is described as 'Remotely control X11 via SSH commands generated by your phone or tablet. Works well on the Raspberry Pi or any other Linux machine. No Mac or Windows'. There are more than 10 alternatives to XMouse Remote Mouse & Keyboard for a variety of platforms, including Mac, Android, Windows, Linux and Android Tablet. The best alternative is KDE Connect, which is both free and Open Source. Other great apps like XMouse Remote Mouse & Keyboard are Unified Remote (Freemium), Remote Mouse (Freemium), AIO Remote (Free) and Mobile Air Mouse (Freemium).
KDE Connect is a project that aims to communicate all your devices. For example, with KDE Connect you can receive your phone notifications on your computer, or just use your phone as a remote control for your desktop.
Unified Remote is an app that lets you control your entire computer from your mobile device. In short, it turns your device into a WiFi or Bluetooth remote control for all the programs on your computer. It is easily the most feature-filled Mobile-PC remote available.
AIO Remote stands for All In One Remote, With All In One remote, you can control any application ever by creating your own fully customized custom remotes. You can use your Android/Blackberry phone/tablet. Windows, Linux and Mac are supported. Features
Mobile Air Mouse instantly transforms your mobile device into a motion-based mouse, trackpad, and wireless remote for your computer! It uses the built-in accelerometer to translate your hand motions into mouse movements on your screen.
VNC client with various modes for keyboard (special keys included), mouse, etc. Can start vnc server through ssh (great to connect over the internet through ssh). Allow connecting to vnc servers on various platforms (standard protocol) to emulate the mouse, keyboard, etc.