Castlevania: Simon's Destiny is a free (non-profit), fan-made small game developed independently by Batandy with GZDoom engine, based on Konami's Castlevania franchise. This game was originally announced and released in 2017. It is completely standalone, not an MOD (so doesn't require DOOM2.wad), only GZDoom is required to play!

Many people like to download all kinds of free resources from Internet through BT clients, because the download speed of this way can reach the limit of the user's network bandwidth, and the acquisition of resources and software operation are very simple. More importantly, BitTorrent is great for downloading large files, such as gigabytes of high-definition video. Previously, this process could only done on a computer. But now, with the speed of the mobile network and the space on the phone increasing significantly, it's becoming a matter of course to download files directly on the phone via BitTorrent.

3D-Tool is a versatile and universal tool for visualizing, analyzing and converting 2D/3D CAD model files, developed by 3D-Tool GmbH & Co. KG from Germany. It is capable of importing and reading all common 3D and 2D CAD data interchange formats and some native CAD file formats, and provides various operations for visualizing, analyzing, marking, and collaborating CAD projects. Thus, you can do in-depth analysis of assemblies or individual parts and develop solutions.

vvctre is a free, open-source and cross-platform Nintendo 3DS emulator working on Lua scripting language (the default script is script.lua). It was created by Valentin Vanelslande, developed based on Citra for Windows 7+ and Linux platforms, and released as open source under the GNU GPL V2 license.

One of the common situations when you get music from the Internet is that there is no album cover in some music files. For music aficionados, this is unbearable. Although some music player programs have built-in features such as tag and album cover fixes, they are still not professional or powerful enough to be considered indispensable.