Engity's Bifröst is described as 'Highly customizable SSH server with several ways to authorize a user and options where and how to execute a user's session' and is an app. There are three alternatives to Engity's Bifröst for a variety of platforms, including Linux, iPhone, BSD, Self-Hosted and Cygwin apps. The best Engity's Bifröst alternative is OpenSSH, which is both free and Open Source. Other great apps like Engity's Bifröst are Warpgate Bastion and Gravitational Teleport.
OpenSSH is a free version of the SSH connectivity tools that technical users rely on. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other attacks.
Warpgate is a smart SSH, HTTPS, MySQL and PostgreSQL bastion host for Linux that doesn't need special client apps.
Teleport is an identity-aware, multi-protocol access proxy which understands SSH, HTTPS, RDP, Kubernetes API, MySQL, MongoDB and PostgreSQL wire protocols.
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