AppLocker

AppLocker can password protect individual apps on your Mac. It's easy to use, and there is absolutely no configuration required. Just start AppLocker, add a password, and select the apps you want to keep private.

Use this tool and stop worrying about your privacy when you borrow your computer to a guest, friend, or family member. No one will mess with your important apps anymore.

Features:

• Password protect individual applications on your Mac
• Easy to use, absolutely no configuration required
• Block access to applications that you want private and avoid
sneak peeks from guests, family members, friends or co-workers
• Perfect for anyone who uses a Mac in the office or at home and shares the computer with co-workers, family members or guests

Note: While the software is classified as free, it offers in-App Purchases.