KeyCheck is a free and portable Windows/Office activation auxiliary means written by Ratiborus from Russia. It is mainly designed to view and verify the validity of product keys in batch for multiple editions of Microsoft products, including Windows 7, 8, 8.1, and Office 2010, 2013.

You've probably heard this formula: program = data structure + algorithm. What it means is that: data structure is the skeleton of a program, and algorithm is the soul of the program. Therefore, data structures and algorithms are very complex, abstract and difficult to understand knowledge. Even for a skilled programmer, it is not easy to master both data structure and algorithm well.

The main disadvantages of using a rented third-party enterprise post office for corporate users are as follows: 1) a lot of junk emails are received day by day; 2) there is nothing we can do every time something goes wrong, because most of the relevant resources are not under our control. In this case, we can try switching to MDaemon mail server. This way, not only will the received spam emails decrease significantly, but also network administrators can quickly lock down and fix problems based on the logs provided by this software on their own.

SpeedTree (AKA: SpeedTree Modeler) is a professional, award-winning and industry-leading 3D trees modeling software suite developed by IDV. It allows user to model, texture and animate both stylized and photorealistic vegetations for VFX, Arch/Viz (architectural visualization), or matte paintings. At present, it is widely used in film, game, animation, military simulation, landscape design and other fields to help designers and workers more easily and efficiently complete their works.

Burp Suite (Burp for short) is a well-known and popular integrated tools platform that is used to perform security penetration tests for web applications (actually it's more commonly used for hacking activities such as web attacks), written in Java, developed by PortSwigger from United Kingdom.