SecretHub - SecretHub is a developer tool to help you keep database passwords, API tokens, and other secrets...
Utimaco SecurityServer - Utimaco SecurityServer is a Hardware Security Module that offers cryptographic key security for database servers no matter how large scale your organization is.
StackExchange Blackbox - Safely store secrets in Git/Mercurial/Subversion. Contribute to StackExchange/blackbox development by creating an account on GitHub.
AWS CloudHSM - Data Security
CyberArk Conjur - Programmable open source interface that securely authenticates, controls and audits non-human access across tool stacks, apps, containers and cloud environments.
Thales SafeNet Luna HSM - Thales SafeNet Luna HSM is an open-source HSM that protects encryption keys used by applications in on-premises, virtual, and cloud environments.