Audacity is a free software you can download from audacityteam.org. With this powerful tool you can make many types of lesson materials such as audio conversations, mini-lectures, and vocabulary models.
Make Listening Puzzles
Audacity is also a fun way to make listening based puzzles or jumble activities.
This video shows how to install Audacity, create a simple audio file, and export in either WAV or MP3, the two most common formats for audio content.