Open source alternative to Auth0 / Firebase Auth, etc.
FIDO® Certified StrongKey FIDO Server (SKFS)
Graphical message and file encryption tool
An Android library that prevents your app from being pirated
SLS Team Java Library
Free DNS based Ad Blocker for Android
Open source version of Google Authenticator (except the Android app)
Open Source Security tool to audit hashed passwords.
Two-factor authentication system