ReactOS is a free, open-source Windows NT-like operating system for both 32-bit and 64-bit personal computers, originally developed in 1996. It maintains system-level compatibility with Windows (including computer programs and device drivers developed for Windows Server 2003 and later versions of Windows), and is committed to becoming a perfect replacement for the Windows NT series.

Windows 11 was released in 2021. Although it is strongly recommended by Microsoft, because of its high hardware requirements, high installation/upgrade threshold, more bloated installation package, excessive disk space occupation, too many bugs, especially compared with the relatively mature Windows 10, there is no obvious advantage, Windows 11 has not been popularized until today. In addition, in the Windows 11 native system, many system components and functions are almost completely useless for the vast majority of ordinary computer users.

LineageOS (successor of CyanogenMod) is a very popular free and open-source operating system for various Android-based mobile devices (smartphones, tablet computers, and set-top boxes). It can make your idle, increasingly dull old Android-based phones or tablets shine again.

In fact, we are using Linux OS every day and everywhere, but most people don't realize it at all. The reason is that the only area that Linux has not conquered is the desktop operating system, which most people can touch is either Windows or Mac. Even Linux has dominated the Internet of things, mobile phone and data center, it's still considered out of the mainstream if it doesn't succeed in the desktop OS field.

Ubuntu has become bloated and extremely slow (even has started to follow the trend of quickly refreshing the version number, and indulges in this disgusting behavior) for a long time, and its requirements for hardware configuration has far exceed those of Windows now. In other words, running an Ubuntu OS today means making your computer fan spinning at a full jump all the time. The noise of fan alone is painful enough. As a result, more and more people are abandoning Ubuntu, meanwhile increasing lightweight alternatives has emerged and are emerging, and many of them are even able to run smoothly on a USB device, not to mention HDD or SSD. Thereinto, Manjaro is one of the best.