In today's society, the barcode (from United States) and two-dimensional barcode (QR code, short for Quick Response Code, AKA: matrix barcode, from Japan) that can be seen everywhere make our modern life easier. They can hold a large amount of information in a small space, which can be used to track and locate products information. Especially the QR code, it can even be used to call other product information on the Internet.

Skype is currently the world's most popular free HD instant messaging software (and VoIP) for all kinds of desktop and mobile platforms. Low system resource requirement, high-quality voice communication and high stability have won its hundreds of millions of users around the world. After acquired by Microsoft in 2011, it became an independent department of Microsoft. And in 2013, if finally replaced Microsoft's own instant messaging tool MSN. In 2014, it released an embedded web version.

AutoCAD is undoubtedly the most popular and powerful CAD modeling software. But as a commercial software, it is really, really expensive. FreeCAD is a free, open-source, cross-platform and general-purpose 3D CAx (CAD, CAM, CAE), PLM modeling tool specially designed for home user/hobbyist, experienced CAD user, programmer or educator.

Decompiler and disassembler are essential tools for any sharp-sighted programmers. No matter which programming languages, they have their corresponding decompilers. For compiled Java binary class file, there are two excellent decompilers: they are freeware Java Decompiler and commercial software DJ Java Decompiler (AppNee will release its related resources later).

DjVu is a hierarchical image compression technology for distributing documents and images with ultra high compression ratio. Under the same quality level, it has only about 1/10 file size of PDF. It was developed by AT&T Labs in 1996 and enables the high-quality scanned images of almost any traditional printed materials to be transferred through Internet at a very high speed.