TooDo is a free Android application which enables the owner to manage smartly all the things he needs to be done, at the palm of your hand.

Finally, an on-screen keyboard for Android!!!
Enter text without having to slide out the keyboard...

Budgets is an Android application that helps you track your spending and keep to a budget.

Paperdroid is an offline article reading Android app that integrates with the excellent service Read It Later and/or Google Reader.
Found an interesting but long article while surfing in a costly internet point? Skimming hastily through your feeds for worthy posts? Just save the page to Read It Later (via bookmarklet, the Firefox extension etc.) or star it in Google Reader and have Paperdroid automatically download it to your trusty Android phone for offline reading pleasure - later.

Walk down the street with this application for search of free Wi-Fi.

With Multi Mount SD-card you can access to your SD-card from your
computer and PC simultaneous.

A unique app that allows you to customize your browser's home page using your favorite links so they are easily accessible. You can organize them into folders and enjoy several home page themes and styles.

Mobile Forex is a great free tool for monitoring real-time currency market news, foreign exchange quotes, build charts and perform technical analysis on your smartphone or tablet device on a go. It is free, it is convenient, it is smart solution for smart people who don’t like waste time.

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+.