OpenSSL
One of such specialized tools that can generate a TLS digital certificate and is very popular is called OpenSSL. OpenSSL can be found at: https://www.openssl.org/. OpenSSL is an open source commercial grade TLS toolkit that can be used to perform a variety of tasks; among them is to generate self-signed digital certificates. The OpenSSL organization by itself does not provide prebuilt binaries for the tool. However, there is a wiki page that lists third-party places where a binary can be downloaded for the tool. The wiki page can be found at: https://wiki.openssl.org/index.php/Binaries. Once you have the tool downloaded, here is an example of how to make use of it to generate a digital certificate in addition to its private key:
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