At the same time I searched about mp3/Youtube tools that are below indicated.
All these software are freeware.
1. FreeRip CD to mp3 converter with Tracks and Album info.
http://www.freerip.com/
2. Fre:ac CD to mp3 converter with Tracks and Album info.
http://www.freac.org/
3. If you want to convert your videos/audio on line you can use the following link :
http://media.io/it/
4. mp3DirectCut It is an easy tool to cut mp3 music:
https://mp3directcut.it.uptodown.com/windows
5. Mp3 Tag editor :
http://www.mp3tag.de/en/
6. Free youtube to mp3 converter
http://www.dvdvideosoft.com/it/products/dvd/Free-YouTube-to-MP3-Converter.htm#.VkjUTvkveUk
7. Free youtube download:
http://www.dvdvideosoft.com/it/products/dvd/Free-YouTube-Download.htm#.VkjT8PkveUk
8. CD to MP3 Freeware
http://www.eusing.com/CDRipper/CDRipper.htm#.VkkCLfkveUk
[update 2015.12]
9. Youtube to mp3 on line website:
http://www.clipconverter.cc/it/
[update 2021.10.16]
10. MP4 to mp3 converter