KeyStore Explorer is described as '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' and is an app. There are six alternatives to KeyStore Explorer for a variety of platforms, including Windows, Linux, Mac, Flathub and Flatpak apps. The best KeyStore Explorer alternative is xca - X Certificate and Key management, which is both free and Open Source. Other great apps like KeyStore Explorer are Portecle, TinyCA, gnoMint and SphereSSL.
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.
Portecle is a user friendly GUI application for 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
gnoMint is an X.509 Certification Authority management tool ; an easy CA managing tool for graphical and command line environments. //
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.
Look no further if you are you looking for a simple way to mass produce certificates.
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Easy to use, free and powerful.