Apps similar to Certificate Management App include xca - X Certificate and Key management, which is free and open source. Other options are KeyStore Explorer, TinyCA, gnoMint and SphereSSL. In total there are six Certificate Authorities like Certificate Management App for Windows, Linux, Mac and self-hosting.
X Certificate and Key management is an interface for managing asymetric keys like RSA or DSA. It is intended as a small CA for creation and signing certificates. It uses the OpenSSL library for the cryptographic operations.
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KeyStore Explorer is an open source, intuitive GUI replacement for the Java command-line utilities keytool and jarsigner. KeyStore Explorer supports creating, managing and examining keystores, keys, certificates, certificate requests, certificate revocation lists and more.
TinyCA is a simple graphical userinterface written in Perl/Gtk to manage a small CA (Certification Authority). TinyCA works as a frontend for openssl
Web-powered SSL certificate manager with DNS integration, auto-renewals, and cert tracking. It's like if Certbot and ZeroSSL had a baby. Certbot but more friendly, smarter, and with a dashboard.
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