The iClock android app is an exact replica of the iPhone's clock app. This is completely rewritten in Java for Android. Its has all the features that the iPhone version has.

ES App Lock can 
 ✔help lock apps on your device 
✔protect your private settings
✔prevent other people from seeing your messages,emails,photos,videos and all files 
With the help of ES App Lock, you may never worry about your parents, your friends , your workmates , your children or anyone borrowing your phone

Quick Questions is a FREE user/community based questions and answers app.

A High Quality voice recorder for wave and mp3 files.
Schedule a recording to start in background with screen off.

This Calendar Widget offers many sizes and shows as many events as possible.

An effortless way to track attendance
Are you an educator? Roster app lets you keep track of your students' attendance. Whether you are a college professor, workshop facilitator or a guitar instructor, forget clumsy piles of paper since your Android-powered phone is already in your pocket. More information on http://www.flapsapps.com/roster-android/
All features are available in demo, but you cannot add more than one class.
Requirements: Android 1.6+.

Speed up phone;
Save battery;
Auto kill & widget;

Quick App Killer is a tool to kill running tasks for speeding up your phone, saving your battery life;

Best task/app killer on Android Market.