WinMerge – compare and merge files quickly
WinMerge is an Open Source differencing and merging tool for Windows. WinMerge can compare both folders and files, presenting differences in a visual text format that is easy to understand…
Free
VirusTotal
I use this every few days or more often to have peace of mind about that link I’m about to click.
NIST Cybersecurity Framework (CSF) Version 1.1
The gold standard of cybersecurity frameworks.