This app alerts you every time the police kills someone in the United States.
Free for iOS.
3. Circle of 6
Signal is an encrypted chat and voice call app. It works just like your favorite messaging apps, but uses end-to-end encryption. Basically this means your data is coded as it travels, and each person has a key to unlock secure messages on their own end, so the phone or internet company can't see your messages.
Ezing is an encrypted messaging app for Android that uses a protocol you're already very familiar with: email.
Free for Android.
9. Oh Crap!
10. HTTPS Everywhere
1Blocker is a tracker and ad blocker specifically for Safari on the iPhone. An added bonus of blocking ads: you use less data.
Free on iOS.