LOIC (short for Low Orbit Ion Cannon) is a free and open-source network/website stress testing tool initially developed by Praetox Technologies (currently maintained by the open source community) with C# in 2014. It's made for educational purposes only (that's to say, you should not use this software for illegal or unethical purposes, including activities that give rise to criminal or civil liability), and intended to help server owners develop a "hacker defense" attitude.

Over the last 20 years, the most popular two music players on Windows have been Winamp and foobar2000. By contrast, the former focuses on exquisite appearance and ease of use, while the latter is for power users to chew over. So, Winamp is actually more popular and has more users than foobar2000, just like the relationship between WinRAR and 7-Zip. In other words, foobar2000 is only suitable for advanced computer users who like to play around with powerful software (not for AppNee).

diagrams.net (formerly called Draw.io) is a completely free, open-source, cross-platform and stand-alone flowchart drawing application that can be used as a browser-based web application, desktop application and plug-in for some other software. That's to say, you can use its web edition directly in a web browser (no registration required, no limitations, no catches), or use its desktop edition offline under Windows, Mac or Linux OS.

The greatest benefit of portable software is that there are no compatibility issues with various system versions. The packaged application always runs in isolation from the operating system running this application, and has its own registry and file systems for reading and writing data. As a result, portable software can use different versions of the same software on the same computer without affecting the system's registry or file system, ensuring its security and integrity. This way, you can even use untrusted applications without any risk to your system environment.

A pre-press producer often has to proofread a document. The usual way is to open the source on the left, open the manuscript in production on the right, then carefully look for differences. The overall process is really tedious, lengthy, eye-straining, energy-consuming, maddening, and most often there are omissions. If you often have to compare PDF documents at work, DiffPDF can help you finish the document comparison work easily and efficiently.