A free program for Android, by Ajaxsoft Mobile.

This is a free application that allows you to record EVP and use it as a tool to search for ghosts, spirits, and other unknown entities. The app allows you to record in different ways and formats, make manual adjustments, and even download the data to analyze it later. The more precise the recording, the more sensitive the analysis, and the more you will be able to learn about the paranormal. It can be used for hauntings and other paranormal activity, and the data recorded can be saved, analyzed, and even uploaded to the cloud. 

If you are an enthusiast of the paranormal, this app is for you.