DuplicateFinder

DuplicateFinder is a lightweight application developed in Java, which can be configured to find duplicate files on the computer. This way, you can remove cloned items and make room for new data, especially if your storage device has a low capacity.
Before proceeding any further, you should know that it doesn't come equipped with features for removing duplicate items, so you have to do this manually by finding the files in Windows Explorer.

Needs Java to run

Provided that you have downloaded and installed Java Runtime Environment on your computer, you don't need to set up anything else. The program's packed in a single executable .jar file that can be saved anywhere on the disk and simply double-clicked to launch the tool.
It doesn't add new entries to the system registry. On the other hand, it automatically generates a plain text document in the same location as itself to display scan statistics.

Find and remove duplicate files

The interface is represented by a single window with a simple design and layout, where you can begin by entering the starting directory to scan. This can be done by typing or pasting the path.
Results shown in the control panel reveal the number of processed files, search date and time, and total duplicates. The TXT document contains the CRC checksum, size, date of last modification, along with the full paths of duplicate files.

Evaluation and conclusion

The tool didn't put a strain on the performance of the computer in our testing, since it needed a low amount of CPU and RAM. No error dialogs popped up and the program didn't hang or crash.
All in all, DuplicateFinder features a simple interface and options to scanning the computer for duplicate files to remove, and it's geared toward all types of users, even those less experienced with such apps.