1. fcarm.exe is a command-line utility from Keil uVision
Location: C:\Program Files (x86)\Keil5\ARM\BIN\FCARM.exe
Note:
FCARM integrates a file optimization algorithm to compress files and creates more compact and smaller executable images. FCARM decides on the file extension which kind of compression is used. Each file group has a different compression and optimization flavor. Can be used to convert html and image files into C-arrays and store them in flash memery.
2. HxD - is a fast free hex editor that can open files of any size (up to 8EB), gives raw read/write access to disks and main memory (RAM), still being as easy to use as any text-editor.
https://mh-nexus.de/en/