Apps similar to Key Manager Plus include KeySmith SSH, which is free and open source. Other options are Keyper, TokenTimer and Keyhub. In total there are four apps like Key Manager Plus for self-hosting, Linux and the web.
KeySmith is a modern GTK4/Libadwaita application that provides a user-friendly graphical interface for SSH key management tasks. It simplifies the process of generating, managing, and deploying SSH keys through an intuitive GUI while maintaining security best practices.
Ireland
EU
Keyper is an Open Source SSH Key and Certificate-Based Authentication Manager that acts as an SSH Certificate Authority (CA), standardizes and centralizes the storage of SSH public keys and SSH Certificates for all Linux users in your organization.
United States
TokenTimer is a certificate lifecycle automation and expiration management platform for DevOps, SRE, platform engineering, security and IT teams.
Ukraine