OpenXPKI - OpenXPKI is a software stack that provides all necessary components to manage keys and certificates...
KeyStore Explorer - KeyStore Explorer is an open source GUI replacement for the Java command-line utilities keytool and jarsigner. KeyStore Explorer presents their functionality, and more, via an intuitive graphical user interface.
Dogtag PKI - The Dogtag Certificate System is an enterprise-class open source Certificate Authority (CA).
Vault by HashiCorp - Tool for managing secrets
Marlin - Marlin is a new GTK3-based file manager for Linux, pretty slick and fast.
VAULT - A password manager for freelancers, developers, agencies, IT departments and teams. VAULT safely stores account information and makes it easy to share between co-workers, other team members and clients.