AutoCAD is undoubtedly the most popular and powerful CAD modeling software. But as a commercial software, it is really, really expensive. FreeCAD is a free, open-source, cross-platform and general-purpose 3D CAx (CAD, CAM, CAE), PLM modeling tool specially designed for home user/hobbyist, experienced CAD user, programmer or educator.

Aegisub (successor of the original SubStation Alpha and Sabbu) is a free, open-source and cross-platform advanced subtitles creating & modifying tool. Recognized as an industry standard of all subtitle editors, it is widely used by numerous subtitle groups and subtitling fans for the subtitling and translation of concert, OP, PV, TV, animation and some other aspects like video post-production.

Mind mapping is an effective way to express human radioactive thinking. It values both diagrams and words, uses the hierarchy figure to illustrate the relationship between various topics. By building memory links using the topic keywords with images, color, etc., such kind of software can make full use of the law of human brain memory, reading and thinking to help people unlock the infinite potential of human brain.

Free online file hosts are good place to share our resources. However, these websites generally use the browser's built-in downloader to download files, and their download methods are widely different. Even a few ones support multi-threaded downloading, you often need to enter verification code, wait dozens of seconds to tens of minutes, and have to fight with the flying ads, popups first for finding out the real download button. More exasperating is, once the Internet connection is broken, all has to start from scratch (because many file hosts do not allow you to continue file transferring from breakpoint)... Therefore, for most of us, downloading files from online storage space has become a painful thing. As a consequence, JDownloader came into being many years ago.

PotPlayer is a new generation of multimedia player developed by KMPlayer's original author Kang Yong-Huee, after he joined the Daum company (a web portal in South Korea). With relatively small size and clear UI, PotPlayer achieved good support to most of video formats.