Other than Emojipedia, this stuff is pretty boring and dry… Even to me! But this is stuff I find useful in my day job and general tech life.

• Fontshare: Free fonts. Nuff said.
• Convert Case: A site that allows you to convert badly formatted text to the correct case.
• Christopher Johnson’s ASCII Art Collection: A cool ASCII art collection.
• Emojipedia: Emoji reference site.
• Fsymbols: Font/text symbols generator and reference.
• Unicode Emoji: Official Unicode emoji standards and mapping.
• Full Emoji List: Official list that shows what Emoji renders as on different platforms. 
• Font Awesome Guide: Font Awesome reference.
• QR Code Generator: Good, simple and ad free QR code generator.
• ExplainShell.com: Tool to help one decipher shell command code.
• JSONLint: JSON validator.
• JSON:API: Specification for building JSON data APIs.
• Table to Markdown: An online too to convert spreadsheet tables to Markdown.
• xrg.es: PHP regular expression tester.
• Unicode Character Inspector: It is what it is: Unicode character inspector.
• HTML5 Canvas Fingerprinting: Explanation of how canvas fingerprinting works.
• User Agent String: Simple website for showing your browser’s User-Agent string.
• Domain History Checker: Tool for getting domain history information.
• intoDNS: GetDNS — and IP related — reports and info for a hostname.
• DNS Propagation Checker: Tool to check DNS propagation.
• MX Toolbox: MX lookup tool and other related stuff.
• MaxMind’s GeoIP2 City Database Demo: GeoIUP lookup tool that can handle IPv6.
• GeoIPLookup.io: A good basic GeoIUP lookup tool.
• Vultr: IPv4 Converter: Very good IP address analysis and conversion tool.
• Hacker Target: WordPress Security Scan: Good passive WordPress vulnerability scanner.
• Google CSP Evaluator: Good CSP (Content Security Policy) evaluator.
• WAVE: Web Accessibility Evaluation Tool: A suite of evaluation tools that helps authors make their web content more accessible to individuals with disabilities.