FileInsight is described as 'McAfee FileInsight, developed by McAfee Labs, is an integrated tool environment for website and file analysis. Its many built-in editing and analysis features can be easily extended through simple Python-based plugins' and is an app in the Development category. There are six alternatives to FileInsight for Linux, Mac and Windows. The best alternative is HxD, which is free. Other great apps like FileInsight are UltraEdit (Paid), 010 Editor (Paid), DHEX (Free) and Reverse Engineer's Hex Editor (Free, Open Source).
010 Editor is a professional text/hex editor designed to edit any file, drive, or process on your machine. Using Binary Templates technology, 010 Editor allows a binary file to be parsed into a data structure that can be understood.
DHEX is a more than just another hex editor: It includes a diff mode, which can be used to easily and conveniently compare two binary files. Since it is based on ncurses and is themeable, it can run on any number of systems and scenarios.