JNG Tools is a useful set of applications, offer you the needed means for managing your files. With its applications youll be able to clean your hard drive, find and remove duplicates, calculate file hashes and more.
JNG Tools Features:
1. Duplicate File Finder is a tool which finds duplicate files on your computer or on other computers connected as mapped drives or network shares.

It is ideal for finding and removing duplicate photo and music files.

It is recommended that you do not use Duplicate File Finder to search your Windows system folder or your Program Files folder. There are often duplicate files in these directories that are required for correct operation of the system.

2. Folder Diff is a tool which compares the files in two folders, including subfolders. It performs a byte-by-byte comparison of files without regard for filenames or subfolder names. Then for each of the two folders, it lists the files that are in that folder but not in the other folder. It is useful for comparing folders of photo files, even where the files have been renamed. Note: FolderDiff is not a file comparison tool.

3. Disk Wiper is a tool which fills up the unused space on a disk drive (or USB flash drive etc) with random bytes of data so that previously deleted files are securely overwritten. It is ideal for wiping memory sticks which have previously held sensitive data, before passing them on to someone else, and also for wiping your personal data from a hard drive before disposing of a computer.

Usually when a file is deleted it is just marked as deleted and its actual contents remain intact as free space on the drive until that free space is re-used.

There are several secure file deletion programs available but they will not necessarily work in all circumstances due to the tricks that some operating systems play, and of course even if they do work reliably when they are released, they are not able to predict future changes to the operating system, including changes introduced by service packs and security updates.

4. File Hasher is a tool to calculate the MD5 and SHA1 hashes (also known as digests) for files.

This is typically useful when downloading large files from the Internet to check that the files are not corrupted. Many web sites display the hash values of downloadable files for this purpose. It can also be used to see if the contents of a file have been changed since the last time the hash value was calculated.

5. CRC Generator is a tool for calculating the Cyclic Redundancy Check value of a file.
This is typically useful when downloading a large file from the Internet to check that the file is not corrupted. Many web sites display CRC values for downloadable files for this purpose.

The license of this software is Free Trial Software, the price is $40.00, you can free download and get a free trial.