This app will help you free a few dollars for your ramen fund by allowing you to create unlimited packs of flash cards on your phone, instead of index cards. Simply create a pack, add a card, fill out the front and back, and keep adding cards as you need them. When you’re done filling out the cards, swipe left or right to move to each card and tap on the screen if you need to see the back. You can also mark a card as “known” and StudyDroid will keep track of your pack knowledge by displaying a percentage of known vs. unknown.
2. Droid Scan (free)
If you’ve ever taken a picture of a white board with a regular camera, it probably hasn’t turned out quite right: Unless you’re directly in front of the board, it won’t look square. Droid Scan uses perspective correction to convert images into high-quality scans instead of distorted messes. After snapping a picture, set up four points to crop around your content. From there, you can share your shot via email, Picasa, or SMS.
3. 3banana Notes by Snaptic (free)

4. HandyCalc (free)
Less stuff to carry, more money in your pocket; it’s a scientific calculator!
5. Wapedia (free)

6. SciencePal ($1)
SciencePal is a great bundle for referencing a lot of your science needs. It includes elements, constants, polyatomic ions, the solar system and nuclides. Each tool is detailed and quick to access.
7. CoursePro (free demo, $3 for full)
With CoursePro you can track your classes, assignments and grades. Create a class, insert assignments and enter information like meeting times, the percentage each assignment counts toward your overall grade, alerts for due dates and any other additional notes you need to keep yourself focused and on track.
8. Elements (free)

A periodic table of the elements is a handy app for your science courses. Just click on an element to look up its melting point, appearance, atomic radius and more.
9. ColorDict (free)

ColorDict is hands-down the best dictionary app on Android. It’s hampered by slightly confusing installation: You need to install the software first, then download the data that goes into the dictionary (the actual words). There are many options for different kinds of data as well (such as a thesaurus plug-in). Once you’ve downloaded each of these plug-ins to your phone’s SD card, the dictionary is ready to go. I have a dictionary, thesaurus and spelling data in my ColorDict and they all appear under any search term, color coded.
10. Voice Recorder (free)
This app does exactly what it says. After you finish your recording you can save the audio file and e-mail it to yourself. If you want to keep the recorder on while using other apps, press Menu, go to Preferences and enable background recording.
Source : http://www.wired.com/gadgetlab/2009/12/10-android-apps-for-the-tech-savvy-student/
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