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Discover tools from different categories to expand your toolkit beyond Astronomy.

Verify SSL certificates, check expiration dates, validation status and certificate details with our free SSL checker tool.

Create mailto links with pre-filled subject, body and recipients. Generate email links for your website.

Calculate your Resting Metabolic Rate to determine baseline calorie needs. Understand the energy your body requires at complete rest.

Convert special characters to HTML entities and decode HTML entities back to characters. Free online HTML encoding tool.