SecureBridge - Сlient and server components for SSH, SFTP, FTPS, SSL, HTTP/HTTPS, WebSocket, and SignalR protocols
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
FireSSH - After 13 years and 25 million downloads later, Firefox has officially removed FireFTP and FireSSH support from the browser. Thus, I've ended support / development of the addons. I recommend switching to Waterfox to continue using the addons.
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
Userify - Userify is a cloud-based SSH key management solution.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.