Wifi Mouse is a free Android app developed by Vivid Designs that allows you to use your phone as a remote control for your computer. It is compatible with Windows, Mac, and Linux. With this app, you can use your phone's touchscreen like a laptop touchpad or type with the Android keyboard.

In addition, Wifi Mouse features media keys such as volume up/down, mute, prev song, next song, and play/pause, as well as screen mirroring, allowing you to view your computer's screen from your phone. The app also includes a file manager that lets you browse your computer's files, move them around/open them, upload files to your computer (good for screenshots, screencasts), and download files from your computer for viewing on your phone. Moreover, you can start applications/run console commands, view your running processes, CPU/RAM usage, kill processes eating up too much computing power, shut down/restart/log off/sleep your computer remotely, lock screen/blank your screen/change brightness remotely, and use it as a generic presentation remote for things like Powerpoint or Libreoffice impress.

Overall, Wifi Mouse is a useful app for anyone who wants to control their computer remotely from their phone.