My favorite choices for business purposes-Skype(communication), paypal(payments), Apptivo(Management) and non business purposes- whatsapp(chat), Google play store(Games, etc).
Leo privacy is my favorite app. So easy to operate. It is a security guard software which protects your privacy. You get to set a unique password or pattern. It is more efficient than some security apps I have used before. I am happy I found this app.
Right now probably my favorite app would have to be the Netflix App. It works well even when the internet connection is low. I can check out a movie or my favorite shows on the go. The interface is simple and also easy to use.