Bluetooth Remote for Arduino is a free Android app developed by CSA Apps in the Utilities & Tools category. The app allows you to create your own custom remote control with fully customizable buttons and instructions. It can be used with Bluetooth modules like HC-06 and HC-05 and is perfect for controlling BT cars, robots, and home automation devices.

The app's special features include the ability to make any number of remotes with various push/toggle buttons and save them. The app can also turn on Bluetooth, scan for available devices, and select the relevant device when more than one device is available. Additionally, the app saves the last connected device's MAC address with remote, which means there's no need to connect when you use your remote after the first time. It will auto-connect to the relevant module with the saved MAC address.

Overall, Bluetooth Remote for Arduino is a versatile and user-friendly app that can be used to control a wide range of devices. Check out the arduino code examples on the developer's GitHub page to make your own code.