Portable Free Apps : Use it And Enjoy it

MediaInfo supplies technical and tag information about a video or audio file. It is free software (free of charge and free access to source code: GPL or LGPL licence)

BonkEnc is a CD ripper, audio encoder and converter for various formats. It can produce MP3, MP4/M4A, Ogg Vorbis, AAC, Bonk and FLAC files.

BonkEnc makes it easy to convert your audio CDs to MP3 or Ogg Vorbis files which you can use in your hardware player or with your favorite audio software. The program supports the CDDB/freedb online CD database and CDText and automatically writes song information to ID3V2 or Vorbis comment tags.

MediaCoder is a free universal batch media transcoder, which nicely integrates most popular audio/video codecs and tools into an all-in-one solution. With a flexible and extendable architecture, new codecs and tools are added in constantly as well as supports for new devices. MediaCoder intends to be the swiss army knife for media transcoding in all time and at this moment, it already has millions of users from 170+ countries all over the planet.

Audacity is an open-source easy-to-use audio editor and recorder. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. Now Audacity 1.3 Beta is out.

Evil Player is a fast, powerful and flexible media player for windows.
Some of Evil Player’s key features include Shoutcast, Icecast and Icecast2 support, low memory footprint and native support for several popular formats (MP3, MP2, MP1, OGG, AIFF and MOD).

Features

• Easy to use
• Small (less than 1MB!)
• Audio formats supported: WAV, OGG, MP1, MP2, MP3, MOD, XM, IT, S3M, MTM, UMX, MO3
• Supports BASS plug-ins
• Low memory footprint
• Radio streaming (SHOUTcast/ICEcast/ICEcast2)
• SHOUTcast recording
• Last.FM support
• Completely free