CentOS (Community Enterprise Operating System) is a recompiled product based on RHEL's (Red Hat Enterprise Linux) open source. Because CentOS fixed a lot of known bugs on the basis of RHEL, compared with other Linux distributions, its stability is more trustworthy. This is the reason a lot of servers requiring high stability use CentOS to replace the commercial RHEL.

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.

Wine (AKA: WineHQ, originally short for "Wine Is Not an Emulator", another bad name for software) is a free and open-source tool designed for running more and more Windows apps on multiple Unix-like (i.e.: POSIX-compliant) operating systems by calling DLL (like Linux, FreeBSD, Solaris and Mac OS X). It's first launched by Bob Amstadt in 1993.

Today, wireless network has got very extensive application because of its convenient use and structure, and will eventually cover every corner on the earth, I believe. But due to its broadcast form of data transmission in a wireless network environment, that will inevitably lead to security issues. Of course we can ensure data security by setting different encryption methods in a wireless router, but some loopholes of Wi-Fi network or the router itself can often make every trained hacker be able to crack/hack it.

For beginners using Windows who are interested in the C/C++ language (anyway, you need to compile your C/C++ programs) or Linux embedded system development, the big headache is switching back and forth between Windows & Linux. Even you have to continuously reboot system in order to achieve the purpose, very troublesome. Cygwin just solved this problem.