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decrypt-openssl-bruteforce
Basic application to bruteforce decrypt files encrypted with openssl and save the plain text file locally.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
This is the first thing that came up on google but there might be other better options https://github.com/thosearetheguise/decrypt-openssl-bruteforce
There are offline tools and even apps that generate addresses and secret keys for you, like this one or the "paper wallet" offline btc app on the Playstore. You don't need to be online to generate bitcoin addresses or its corresponding secret key, you are merely generating a random numer which will cease to exist unless you save it as your own. That's one of the keypoints that make Bitcoin what it is, and will continue to be until quantum computers take over.