Free tools. For anyone with a website.
Check a domain's DNS and SSL, see which PHP versions are still safe, and let people deploy your project in one click. Free, with no sign-up.
DNS checker
Ask four public resolvers and your domain's own nameservers at once: has your change reached everyone yet?
OpenSSL checker
Read a site's certificate as a browser does: is it valid, which names it covers, who issued it and when it ends.
OpenPHP versions
Every PHP version since 7.0, when it was released, and until when it gets bug and security fixes.
OpenDeploy button
A button for your project's README: anyone who clicks it gets your code running on Tanzahost in a few minutes.
Open