SecureCRT (short for Secure Connection to Remote Terminal, originally called CRT) is a classic and stable GUI-based telnet client and terminal emulator for Windows, Mac, Linux, and iOS platforms, developed by VanDyke Software in 1995. It is primarily used to connect and manage remote Unix or Linux servers.

Nmap (short for Network Mapper) is a free and open-source network security scanner for large networks. It was originally developed by Gordon Lyon (Fyodor Vaskovich) for Linux in 1997, later gradually became one of the most popular network discovery and security auditing tools on multiple operating systems with the participation of many volunteers in the open source community.

Without music knowledge foundation, it is impossible to study music deeply. For example, when you are teaching yourself musical instruments or vocal music, you often have trouble reading complex sheet music. But don't be discouraged. Learning music is about effective practice with a method and a goal, not headless practice. In the absence of time and financial resources to find a professional teacher to learn from, it is very important to choose a useful and easy to use music learning software.

Animation:Master (the successor of Animation:Apprentice and Animation:Journeyman) is a very professional, efficient and easy to use 3D character animation application, has the longest history of all 3D software. In 1986, when most people had never heard of computer art and even had no idea what a computer was, the famous Disney company had already used this program to produce animations.

Norton Utilities is a well-known and very classic PC utilities software for DOS and Windows, developed by Peter Norton in 1982 (later sold to Symantec Corporation). It integrates disk editing, disk diagnosis and repair, system optimization, system performance testing, virus detection and removal and many other functions in one place, can help users quickly and intelligently optimize the system, so as to improve user computer performance.