PGP (Pretty Good Privacy) is currently the best and most popular data (including texts, e-mails, files, directories, partitions, and whole disk) signing, encrypting, and decrypting program, developed by Phil Zimmermann in 1991. Its source code is open, and it has withstood the challenges from thousands of top hackers around the world. It turns out that PGP is still the most secure encryption software in the world for now (until the popularity of quantum computers, I think). Without a password, no one can decrypt the data encrypted with it!

On Mac OS, a lot of software needs to be purchased and registered before it can be used. If you want to get software registration keys/serial numbers for free, you can use Serial Box or KCNScrew, which are both free and very useful serial numbers collecting and updating edge tools. Thereinto, Serial Box provides users with valid serial numbers of various Mac software circulating on the Internet, and integrates all of them in one place.

Pixologic claims to be the maker of Sculptris, but actually it had no choice but acquired it in 2010 due to the huge threats from Sculptris, and applied Sculptris' advantages to ZBrush, so as to maintain the market and position of ZBrush. Otherwise, if Sculptris' inventor Tomas Pettersson had chosen to stick to go his own way (although that would have been tough) rather than join into the Pixologic team, then this revolutionary software could have quickly eliminated ZBrush. In other words, it was his own shortcomings that killed his invention, not the competition from Pixologic.

WebDrive is a powerful, convenient and practical Windows file transfer tool. It has a user-friendly and easy-to-use UI, can smoothly transfer and edit files on multiple remote servers. It works by mapping remote servers supporting file transfer protocols such like WebDAV/FTP/SFTP as local network drives utilizing its directories list caching capability, thus integrating them into Windows Explorer/File Manager, and allowing you to easily and quickly manipulate remote files as quickly as you would on a local disk.

MediaHuman Audio Converter is a free and cross-platform audio formats conversion & extraction program for Windows and Mac, developed by MediaHuman. It's written in C++ and Qt framework (for UI), and uses popular free software libraries like FFmpeg, OpenSSL, LAME, and TagLib.