1Weather is about as complete of a weather app as you can find. It comes with all kinds of stuff including current conditions, forecasts, radar, predictions, fun facts about meteorology, graphs, and even a sun and moon tracker. The design is gorgeous as well. It even has widgets. It’s free to use and the $1.99 charge is simply to remove advertising. As long as you don’t mind the occasional banner add, this is a perfectly awesome free app.
AppLock is a free Android app that comes with a lot of options. You can pay for it, get premium features, and no advertising. Or you can view advertising, get the premium features, and not pay anything. Finally, you can use it ad-free, but without premium features. The choice is yours. The app itself is a simple, but powerful app that allows you to lock your apps up tight with passwords so that snooping eyes can’t see them. This is great if you have nosy roommates, kids, or if you just want some piece of mind. You can use the app for free with or without ads (your choice). The ad-free version has a few features missing, but the ads will unlock those features as though you paid for it.
Blue Mail is one of the best free Android apps for email. It features a simple design that helps you keep your emails in line. Additionally, it comes with support for a ton of email providers, color coding for organization, app theme, Android Wear support, and widgets. There are also a variety of smart features such as blocking notifications during certain times (per account) to help customize your experience. It does a lot of things right and very few things wrong. The 4.7 out of 5 star rating on Google Play helps back up that notion. It's actually very good.
Credit Karma is a fun little financial app. What it does is let you check your credit score once per year for free. On top of that, the app will notify you when there are major changes to your credit score. The app offers some other things too, such as potential credit cards that you may qualify for based on your credit score. You don't have to accept those if you don't want to. It's a simple, easy way to check out your credit and start fixing things if needed. It's one of the more underrated free Android apps.