FSE for Mac OS X 1.9.2.10 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. FSE for Mac OS X lies within System Tools, more precisely System Optimization. This Mac application is a product of Software and Computer Systems Company. We recommend checking the downloaded files with any free antivirus.
From the developer:
FSE is a file system events monitor for Macintosh systems running Mac OS X. A file system events monitor is an application that displays and optionally logs all file modifications occurring on a Macintosh computer running Mac OS X, even those being done in the background that the user is unaware of.
You may want to check out more Mac applications, such as MAME OS X, Tutor for OS X Mountain Lion or NTFS for Mac OS X, which might be similar to FSE for Mac OS X.