I've known the CrypTool website for many years, I use it occasioanly when I need to do some crypto and I only have a browser at my disposal. Lately, I'm more inclined to use CyberChef, as it provides also many non-crypto features.

Recently I discoved "Web OpenSSL" on CrypTool: a WebAssembly implementation of OpenSSL.

You can just run it inside your browser:

Issue commands, and download the files from your browser:

Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com