KeePassDroid

Useful app to store your passwords. It's the Android version of KeePass.

KeePassDroid @ Goolge Play

AppBrain Ad Detector

This app lets you see information about your installed apps: concerns, ad networks, social SDKs and developer tools. Concerns section tells you if your apps can access your contacts or accounts, may cost you money, can access sensitive data, etc.

AppBrain Ad Detector @ Google Play

[INFO] Pirate apps can be dangerous

 
If you download a pirate app you should know that it could easily carry a keylogger. That's a program that records your keystrokes and sends it to someone else, so the hacker can see what you type and steal your messages, passwords and personal data.

Read here for more information