TL:DR; Listen to your work when you want!
Let the computer read your documents so that you can listen to them later.
OtsAV Free is the free edition in the OtsAV professional suite of products which are designed for DJs, Radio and TV Stations, Solution Providers, Businesses and AV Enthusiasts.
Switch is an audio file converter for Windows. It can convert many different types of audio files into mp3 or wav format and more.
MP3 M4R Converter converts MP3 to M4R (iPhone ringtone file) and M4R to MP3. The software is an all in one audio converter that supports more than 100 audio and video formats. It supports batch conversion and is compatible with Vista and Windows 7.