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hexed.itOnline hex editor
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Other tools:

Solutions for all PDF problems – 100% free – PDF24

webcrack – deobfuscate and unpack

Unfurl – “extract” info from an URL: Introducing Unfurl

https://dev.to/everlygif/open-source-essentials-mastering-git-github-issues-and-best-practices-for-beginners-4a16

White screen | Online Tool

Datasets: OpenSanctions

Datasets: CFReDS Portal