Torque 3D (full name: Torque Game Engine, TGE for short) is free, open-source and cross-platform 3D game engine developed by GarageGames (originally developed by Dynamix for the first-person shooter game Tribes 2 released in 2001) under the MIT license. It features powerful and complex rendering system, high-speed network transmission, authentic real-time editing, script editing system, as well as maximum flexibility and performance across a wide-range of hardware, and a full suite of tools for producing high-quality Windows and browser-based games development.

DB Browser for SQLite (formerly called SQLite Database Browser and Database Browser for SQLite, DB4S for short) is a free, open-source and cross-platform (Windows/Linux/Mac) SQLite database visual viewer and editor, originally developed by Mauricio Piacentini from Brazil.

The "play after downloading" and "direct play online" for streaming media have an immeasurably vast difference on experience. However, streaming media websites providing online music or video play service have been facing two development difficulties: copyright and server performance. For the former, if they chose to buy the original copyright, the investment will be huge, and comes with too few resources and very slow update; if it was pirated, then that's always possible to be under surveillance and even shut down at any time. In the latter case, the more people visit, the worse the server performance will be, which means either they have to increase the hardware investment, or it's difficult to get further development.

If the CPU model of your computer is relatively new (especially Intel Core i7 and higher), and because you have lost patience with the slick Windows 10 and have to change back to use the older versions of Windows 7, 8, 8.1, even Windows XP, then you will probably receive the following error message while trying to scan or download updates through Windows Update:

Unsupported hardware Your PC uses a processor that is designed for the latest version of Windows. Because the processor is not supported together with the Windows version that you are currently using, your system will miss the important security updates. Please select the "Learn More" link to address this situation.

Arduino consists of two parts: hardware (various models of Arduino boards) and software (Arduino IDE). The hardware part is an Arduino PCB that can be used to connect circuits; the software part is the open-source and cross-platform Arduino IDE (written in Java, based on Processing programming language and other open-source software) - your programming environment in computer that can be used with any Arduino boards. All you have to do is write the code in Arduino IDE, and upload it to the Arduino development board, then the program will tell Arduino PCB what to do and how to do.