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.
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.
EJBCA - EJBCA® is a PKI Certificate Authority software, built using Java (JEE) technology.
Vault by HashiCorp - Tool for managing secrets
OpenXPKI - OpenXPKI is a software stack that provides all necessary components to manage keys and certificates...
Marlin - Marlin is a new GTK3-based file manager for Linux, pretty slick and fast.