From the FTK Website:
Forensic Toolkit® (FTK®) is recognized around the world as the standard in computer forensic investigation technology. This court-validated platform delivers cutting edge analysis, decryption and password cracking all within an intuitive, customizable and user-friendly interface. In addition, with FTK, you have the option of utilizing a back-end database to handle large data sets. Or you can work without one if application simplicity is your goal. Either way you will get the benefit of best-of-breed technologies that can be expanded to meet your ever-changing needs. Known for its intuitive functionality, email analysis, customizable data views and stability, FTK is the smart choice for stand-alone forensic investigations.