

Chromium, as I mentioned, as well as the Android Open Source Project used as the base for GrapheneOS. Their hardware is also very secure, which is why it is used by GrapheneOS. Google Play Store is also one of the most secure app stores for Android, but one of the least private. This is where Google becomes a double edged sword.
Epic, only because I’ve never heard of it so it probably isn’t recommended often. I should note that Vanadium is only available on Android and is very difficult to install if you don’t use GrapheneOS. Trivalent is only available for a small subset of Linux distros (and comes preinstalled on secureblue). Brave Browser is cross-platform and recommended by GrapheneOS as an alternative to Vanadium if you want specific features Vanadium lacks.