Various helpful links.

HTML5UP - HTML5 Website Templates

Responsive HTML5 and CSS3 site templates designed by @ajlkn..

Markdown Guide

The Markdown Guide is a free and open-source reference guide that explains how to use Markdown, the simple and easy-to-use markup language you can use to format virtually any document.

Using SSH for Sudo

Using SSH agent for sudo authentication 13 March 2011. pam-ssh-agent-auth is a PAM module which allows you to use your SSH keys to authenticate for sudo. If you aren’t happy using completely passwordless sudo but don’t want to be typing passwords all the time this module provides a compromise.

YubiKey OTP

OpenVPN OTP with a Yubikey From version 2.4.3 of OpenVPN onwards, this is now possible using a ‘token’ after the initial auth takes place - and using the new token for all auth requirements during a renegotiation.

Block Chain Web Auth

Stellar Web Authentication is a secure method of creating the session between two parties—application and user—that does not require a user to provide anything except his blockchain-related data and does not involve any third-party services on the application’s side.

Bitwarden - Open Source Password Management

The source code for Bitwarden is hosted on GitHub and everyone is free to review, audit, and contribute to the Bitwarden codebase. We believe that being open source is one of the most important features of Bitwarden. Source code transparency is an absolute requirement for software solutions like Bitwarden.