Programming in Objective-C is a concise and meticulous bestseller in the field of Objective-C programming, which covers the latest information on Xcode, Mac OS X Mavericks, and iOS. It detailedly introduces the Objective-C language and the object-oriented programming mode on Apple's iOS and Mac OS X platforms.

YUMI (short for Your Universal Multiboot Installer) is the successor of MultibootISOs, a free, open-source, powerful and user-friendly USB installer maker. It is used to create multi-system bootable USB devices, which can boot multiple operating systems, antivirus programs, disk cloning tools, system diagnostic tools, and more.

Boilsoft Video Splitter (its predecessor is AVI MPEG ASF WMV Splitter) is a simple, efficient and very easy-to-use audio & video splitting software with ultra fast speed. It supports all the major audio and video formats, supports for up to 2 GB size of super large video file. More importantly, the entire splitting process does not need to recode. That's why its execution speed is so fast and has no quality loss (keep the same as the source file).

Zero Assumption Recovery (X) (ZAR or ZAR X for short) is currently the only best data recovery solution (with the most accurate data scan and recovery capabilities) for FAT, NTFS, EXT, and XFS filesystems. It was developed by Alexey V. Gubin from Russia, and enjoys a pretty good reputation and popularity around the world on data recovery field. It seems to have been specifically designed for recovering digital photos from digital devices at first, which has exposed as a free feature now (camera compatibility list for photo recovery).

On hard disk, when you delete some folders, files or even an entire partition, all data is still existing in the same place where it was, and will always be there until overwritten. In fact, the deleting operation is just delete the pointer to the data on disk from MFT (Master File Table), so as to allow the operating system to perform writing operation there. Any data recovery software use this principle to work. Of course, you can delete the data truly and completely. But that requires you to ask special data eraser for help.