WavePad (full name: WavePad Sound Editor, WavePad Audio Editor) is a full-featured and professional audio/music editing freeware for home/non-commercial use. It doesn't need you to have too much basic knowledge for achieving advanced music editing, and is suitable for music lovers who want to manipulate audio files or create their own customized soundtracks.

Modifying the data in memory can be not only used to decode/hack software, also used to hack all kinds of games (especially PC games and emulator based video games). Cheat Engine (CE for short) can make one game easier or more difficult, in other words, that's to be more suitable for you (but not necessarily to be more interesting)! Its principle is - the memory debugging/hacking.

MusicBrainz Picard is a revolutionary music sorting software developed by MetaBrainz Foundation, it's free, open-source and cross-platform. First use of it, maybe you feel its UI is so weird, but once get started, you will find that's really reasonable and user-friendly.

In some cases, we may need to enlarge an image in order to see its more details. For high-definition pictures, if just zoom in several times, its quality can still make users satisfied; But when you need to enlarge it to more than ten times or even dozens of times, that must cause a sudden drop on quality and the appearance of jagged image (also called Mosaic). As to low-resolution images, the situation is even worse.

Mac OS uses the method of drag & drop to achieve the function of cut/paste files by default. As to keyboard shortcuts operation, it only supports for simple content such as text or image, and is invalid to the Finder file manager. But many users turned to Mac OS X from Windows have been accustomed to use shortcuts to operate computer, as a result, this undoubtedly becomes very inconvenient (under Windows, Ctril + C/X/V is so efficient).