Awesome Privacy

Checks if your credentials (Email address or Password) have been compromised in a data breach. See also Firefox Monitor.

Checks how many, and which trackers any Android app has. Useful to understand how data is being collected before you install a certain APK, it also shows which permissions the app asks for.

Show how identifiable you are on the Internet by generating a fingerprint based on device information. This is how many websites track you (even without cookies enabled), so the aim is to not be unique.

Check if your browser safe against tracking. Analyzes how well your browser and add-ons protect you against online tracking techniques, and if your system is uniquely configured—and thus identifiable.

Shows which of personal identity data is being leaked through your browser, so you can better protect yourself against fingerprinting.

Shows your IP address, and other associated details (location, ISP, WebRTC check, DNS, and lots more).

Displays, and removes Meta and EXIF data from an uploaded photo or document.

Check where a suspicious URL redirects to (without having to click it). Lets you avoid being tracked by not being redirected via adware/tracking sites, or see if a shortened link actually resolves a legitimate site, or see if link is an affiliate ad.

Checks if a given website is blocked by filters applied by your mobile and broadband Internet Service Providers (ISP).

Analyses a potentially-suspicious web resources (by URL, IP, domain or file hash) to detect types of malware (note: files are scanned publicly).

Scan websites and shows a security overview, relating to factors such as HTTPS, domain info, email data, www protocols and so on.

Checks if a website or business is a scam, before buying something from it.

Ever been uninstalling programs from your Windows PC and been unsure of what something is? Should I Remove It is a database of Windows software, detailing whether it is essential, harmless or dangerous.

Generates temporary disposable email address, to avoid giving your real details.

Tool for analyzing email headers, useful for checking the authenticity of messages, as well as knowing what info you are revealing in your outbound messages.

Google testing out a new tracking feature called Federated Learning of Cohorts (aka "FLoC"). It currently effects 0.5% of Chrome users, this tool developed by the EFF will detect if you are affected, and provide additional info on how to stay protected.

A tool from Netcraft, for analysing what any given website is running, where it's located and information about its host, registrar, IP and SSL certificates.