For any level of photography enthusiasts, we may be used to taking multiple shots in a continuous, multi-angle sequence at the target in order to capture a good moment or the best shot. The problem is that we are often too lazy to clean up those duplicate photos later that should have been deleted at the very start. Over time, these duplicate photos waste more and more disk space, and are getting harder and harder to organize and tidy up - it has become a big headache to try to go back.

PGP (Pretty Good Privacy) is currently the best and most popular data (including texts, e-mails, files, directories, partitions, and whole disk) signing, encrypting, and decrypting program, developed by Phil Zimmermann in 1991. Its source code is open, and it has withstood the challenges from thousands of top hackers around the world. It turns out that PGP is still the most secure encryption software in the world for now (until the popularity of quantum computers, I think). Without a password, no one can decrypt the data encrypted with it!

EndNote is by far the most well-known and classic bibliographies, citations and references publishing and managing tool for both Windows and Mac platforms. It has an easy-to-use user interface and powerful functions, which can improve the work efficiency of users especially scientific research workers. Whether it is the retrieval, management of literature, automatic acquisition of full text, or the citation and insertion of references in the process of paper writing, the use of SCI (Science Citation Index) periodical templates, it can always provide powerful and efficient help.

PTGui (short for Graphical User Interface for Panorama Tools, or Panorama Tools Graphical User Interface) is a very powerful panoramic photo stitching software for Windows and Mac. It was originally just a GUI front end based on the free and open-source Panorama Tools (AKA: PanoTools), which is the most well-known and multifunctional suite of programs and libraries originally created by a German physics & mathematics professor Helmut Dersch in the University of Applied Sciences Furtwangen.

In the common web application developing, testing and debugging process, developers need to figure out, analyze and eliminate all sorts of network problems by capturing the network communication packages (especially for those apps based on a server), and have a look at what they actually receive and send. At this time, Charles will come in handy.