CopperCube (successor of irrEdit) is a free 3D authoring editor, also the most user-friendly 3D game engine. It is developed based on the free and open-source 3D game engine - Irrlicht Engine (SWFZ Engine was rewritten from this engine too), and its essence is a simple, lightweight but powerful interactive 3D scenes designing software with concise and clear user interface, convenient operation, and humanized design. It is mainly used in the production of 3D application, 3D game, 3D website, and 3D animation.

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.

For privacy protection and data security purposes, it is very necessary to set a login password for the Windows user in use in many environments (especially the public places). But sometimes, we may forget our login password for those computers we don't use very often, or remember the wrong password, and fail to log in. This case, reinstalling the operating system is a inadvisable bad plan; and taking brute-force password cracking is extremely inefficient. Therefore, clearing the original user password has always been the first choice - also the easiest and most efficient way.

ZOC Terminal is a powerful and effective terminal simulator and Telnet client developed by Markus Schmidt from Germany. It is known for its friendly configuration, excellent user interface design, and many practical features. It can be used to connect to and manage the remote Unix/Linux hosts and shell accounts, BBS, IBM mainframes (via TN3270 or TN5250), or just to connect to the hardware devices hosted on the serial ports of your computer.

4K YouTube to MP3 is a simple and practical video to audio conversion tool (its essence is to extract and save the audio track file from video) for Windows, Mac and Linux platforms. It can easily download video from all the popular media websites (such as: YouTube, SoundCloud, Vimeo, Dailymotion, Facebook, Flickr, Metacafe, and Tumblr), then automatically convert the video to MP3/M4A/OGG format of audio file and save to local disk.