After converting, Dangerzone lets you open the safe PDF in the PDF viewer of your choice, which allows you to open PDFs and office docs in Dangerzone by default so you never accidentally open a dangerous document
Another tool courtesy of Micah Lee.

Algoeye collects digital operational security information to inform safety decisions in an increasingly dangerous world.
More information About Algoeye.
After converting, Dangerzone lets you open the safe PDF in the PDF viewer of your choice, which allows you to open PDFs and office docs in Dangerzone by default so you never accidentally open a dangerous document
Another tool courtesy of Micah Lee.
Export messages from iMessage and archive them in a location you control. Messages can be exported as TXT or HTML while maintaining attachments and other message features.
https://github.com/ReagentX/imessage-exporter
This free and open-source software can:
VirusTotal inspects items with over 70 antivirus scanners and URL/domain blocklisting services, in addition to a myriad of tools to extract signals from the studied content. Any user can select a file from their computer using their browser and send it to VirusTotal.
Collection of free tools from CISA. This is a sort I've made focused on tools external to CISA, and tools that are of the most interest to me.
Is this site or online store a scam or safe? Are the reviews real or fake? That is the question ScamAdviser tries to answer for 2.5 million visitors every month. ScamAdviser uses an algorithm to determine if the website is legit with real reviews or a phishing website, selling fake products. Our goal: help consumers make the right choices online.
urlscan.io is a free service to scan and analyse websites. When a URL is submitted to urlscan.io, an automated process will browse to the URL like a regular user and record the activity that this page navigation creates. This includes the domains and IPs contacted, the resources (JavaScript, CSS, etc) requested from those domains, as well as additional information about the page itself. urlscan.io will take a screenshot of the page, record the DOM content, JavaScript global variables, cookies created by the page, and a myriad of other observations. If the site is targeting the users one of the more than 900 brands tracked by urlscan.io, it will be highlighted as potentially malicious in the scan results.
The origins of Algoeye. Scopus Ex Machina: Investigating the Domain Awareness System