Download of FileSumo 1.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The application lies within System Tools, more precisely System Optimization. This Mac application was originally developed by MacAppStudio.
From the developer:
File Sumo is an awesome utility app which helps you to discover and handle huge files that are cluttering and slowing down your Mac space.
Find and Delete Top 10 / 50 /100 Large Files
File Sumo provides the list of top 10/50/100 Large files and their sizes along with the options to view each file in finder, add the file to an exception list or delete the file directly from the app.
You may want to check out more Mac applications, such as FileSumo Pro, which might be related to FileSumo.