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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.
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CyberChef
The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis
Once you have splunk installed and running, you can start ingesting data from your environment, such as your firewall or other machines/services you're working with. There are lots of supported add-ons and guides online to help you with ingesting data. If you don't have data to ingest but still want to play around with performing investigations in Splunk, I would check out Boss of the SOC. It contains a large data set as well as necessary add-ons and apps for you to start playing around. Here is a link to the GitHub repo: https://github.com/splunk/botsv3
I almost forgot my favorite topic, Regular Expressions. It comes handy for parsing and normalizing data. Using https://regex101.com/ and https://gchq.github.io/CyberChef/ , Regex can be lots more than just that.