Apps similar to Smallstep Certificates include xca - X Certificate and Key management, which is free and open source. Other options are Verisign, Dogtag Certificate System, CertHat - Tools for Microsoft PKI and Pkcs11Admin. You can choose from more than 10 Certificate Authorities like Smallstep Certificates for self-hosting, Windows, Linux, the web and Mac.
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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Verisign’s critical yet mostly invisible role – helping to maintain the security, stability and resiliency of the Domain Name System (DNS) and the internet – can sometimes be overshadowed by more visible aspects of the domain name business.
The Dogtag Certificate System is an enterprise-class open source Certificate Authority (CA). It supports all aspects of certificate lifecycle management, including key archival, OCSP and smartcard management, and much more.
CertHat is solution for managing and monitoring digital certificates from Microsoft AD CS but also mother/external PKI sources.
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Pkcs11Admin is an open-source GUI tool for administration of PKCS#11 enabled devices (smartcards, HSMs etc.) which runs under .NET 4.5 on MS Windows and under Mono 3.X on Linux and Mac OS X.
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Enterprise Java Beans Certificate Authority, or EJBCA, is a free software public key infrastructure (PKI) certificate authority software package.
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OpenXPKI is a software stack that provides all necessary components to manage keys and certificates primarily based on the X509v3 cryptography standard.
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Secure digital certificate vault for accounting firms with automated WhatsApp and email alerts. Covers e.firma (SAT), DIAN, AFIP, and e-CNPJ.
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Trustpoint is an open-source platform for managing digital machine identities and their certificate lifecycle in industrial environments.
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The AppViewX CERT+ platform provides users with a full-cycle certificate management suite, enabling 360-degree control and visibility into network infrastructures.
Self-hosted certificate lifecycle management: issue, renew, discover, inventory and deploy TLS certificates across your infrastructure.
A private Certificate Authority for internal (lab) use, based on the open source ACME Automated Certificate Management Environment implementation from Let's Encrypt (tm).
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