In this digital world, there are already too many traditional online file sharing services, but they are not secure (not anonymous or even transparent), free (various restrictions) or permanent (can delete your files or even shut down at any time, for any so-called reason) enough. Although Bit Torrent and its derivatives can share files freely, they are still not secure or convenient enough. So there is OnionShare, a good alternative to all online file sharing services.

Neat Download Manager (NDM for short) is a very practical universal file download manager and accelerator for Windows and Mac platforms (written in C++), developed by Javad Motallebi from United Arab Emirates. It is very similar to the famous IDM in all aspects, but has a cleaner interface and small file size (less than 1 MB), and it is completely free.

PlayOnLinux is a free graphical frontend for Wine on Linux platform (it is called PlayOnMac and PlayOnBSD on Mac and FreeBSD platforms), developed by Quentin Pâris and Aymeric Petit from France in 2007, written in Python and Bash. It allows Linux users to install and run Windows games and applications with ease.

The biggest killer of disk space is not large files, but duplicate files, such as photos, music, videos, eBooks, documents, etc. Large files are actually quite easy to find and clean up, but duplicate files are almost always scattered all over the disk and usually hard to find. It is obviously too inefficient and even impractical to find them one by one by manually comparing the names, sizes, contents and other attributes of a large number of files.

DSynchronize is a classic, small, and free file synchronization tool, developed by Dimio Software from Italy. It has simple and straightforward UI, very stable performance and perfect flow control, supports multiple synchronization modes (manual, real-time, bidirectional, timer, transactional), and can meet different users' requirements for file and folder synchronization and backup.