We highlighted a powerful mobile app that allows you to convert to and from PDF files yesterday. However, if you're sitting on a desktop you might want the flexibility to easily convert and share files. This is where the revamped Cometdocs comes into the picture.
MediaCoder is a FREE universal audio/video batch transcoder distributed under GPL license, which puts together lots of excellent audio/video codecs and tools from the open source community into an all-in-one solution, capable of transcoding among different audio/video formats. The best feature of MediaCoder is the ability to transcode files in batch format. If you're looking to load your music player and you have all your files in different formats, then you can use MediaCoder to convert them all into the format supported by your player.