Kickass Undelete software (version 1.5.5) is a free and open-source tool used to recover deleted files from various storage devices, such as hard drives, USB drives, and memory cards. The software supports multiple file systems, including NTFS, FAT, and exFAT. It also has a simple user interface, making it easy to use for both novice and advanced users. Additionally, the software has a preview feature that allows users to view recovered files before restoring them.