X.509 Websites
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bouncycastle.org
Home of open source libraries of the Legion of the Bouncy Castle and their Java cryptography and C# cryptography resources
320,716 
$ 29,160.00
Exchangepedia
TechNotes about Microsoft Exchange, Office 365, Active Directory, Security, Compliance, Windows platform and other stuff
1,112,482 $ 1,200.00
SAMLTool.com | SAML Testing Tools | Online SAML Debugger | Examples
Web-tool for decode / encode messages, encrypt / decrypt messages, sign, validate, build XML metadata, test idp, test sp, review saml examples and learn SAML.
211,738 $ 43,740.00
CyberChef
The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis
Not Applicable $ 8.95