Hey you would probably be interested in a app that we make called Umbrella. Built by activists, for activists, Umbrella makes it easier to learn about and manage digital and physical security. It has short lessons and checklists on everything from sending a secure email to security at protests. It's free, open source and available on Android.

You can learn more about it at https://www.secfirst.org or download it from Google Play:

https://play.google.com/store/apps/details?id=org.secfirst.u...

You can also reuse our Creative Commons content and check out our code at https://www.github.com/securityfirst