Octopus is an android app which allows you to arrange the keys for key-mapping. You can play games with wireless controller after customizing and assigning buttons with this app. It is a perfect and most popular key-mapper app. It has customizable virtual mouse shortcuts that allows you to customize the keys of mouse for gaming. It has analog dead-zone area where analog movement will not be counted. It is a free to use key-mapper and can be downloaded easily.
