QEMU (short for Quick Emulator) is a free and open-source processor emulator widely used on GNU/Linux platform, written by Fabrice Bellard from France. It primarily converts the binary code written for a specific processor to another through a special 'recompiler', so as to realize the OS virtualization.

OpenMPT (short for Open ModPlug Tracker) is a popular free and open-source sample-based audio tracker from Germany. It was developed in 1997, based on the classic and original ModPlug Tracker written by Olivier Lapicque. Its design purpose is to make writing music on computer become more interesting, easier and more efficient.

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.

LinuxLive USB Creator (AKA: LiLi USB Creator, LiLi for short) is a free and open-source small Windows app from France (developed using AutoIt scripting language), used to smartly and fast create bootable USB installer with several mouse clicks.