OpenIntents

AdWhirl is a free, open source tool that helps you make more money from your iPhone or Android app. It enables you to serve ads in your app from any number of ad networks as well as your own house ads. By using multiple networks, you can determine which perform best for you and optimize accordingly to maximize your revenue and fill all your inventory.

www.adwhirl.com

Android Chart Engine, requires developer license.

http://www.artfulbits.com/Android/aiCharts.aspx

Robotmedia created a helper library to simplify the in-app billing process

https://github.com/robotmedia/AndroidBillingLibrary

kiChart is a chart solutions on android platform, you can use it to create your android chart applications. It’s easy to use, effectively and powerfully. It will save your valuable time in developing.
Features: kiChart provides set of the basic used chart types, (1) Line Chart (2) Bar Chart (3) Pie Chart
Other functions: (1) Support multiple series. (2) Export chart as image file. (3) Define the parameters: margin, size, font color, font size and etc. (4) More controls on y-axis values, you can set float type of value, start-value and end-value.

http://www.kidroid.com/kichart/

This is a packaging of the project "Android PDF Viewer" (http://andpdf.sourceforge.net/) into a reusable library to make PDF viewing easier from within your Android application. To remain consistent with the licensing of the original project, it is licensed under the LGPL.

https://github.com/jblough/Android-Pdf-Viewer-Library

This open source library aims to help the implementation of JSON-RPC clients in android applications. The library provides a simple API to perform JSON-RPC calls from an android device.

Project page on google code :
http://code.google.com/p/android-json-rpc/

Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI elements in Android. Our goal is to make Android coding simpler, easier, and more fun.

Features include: Less Code, AJAX Callback, Image Loading, List Item Optimization, XML Parsing, Chaining, Non-intrusive, and more...

http://code.google.com/p/android-query/

Smack library (XMPP) with heavy patches for Android.

http://code.google.com/p/asmack/

Bluetooth library for devices with Android < 2.0

http://code.google.com/p/android-bluetooth/

Open source 2D game framework for Android

http://code.google.com/p/cloak/

Great collection of reusable code for various objectives.

http://github.com/commonsguy/cw-android

Deacon is a free and open-source Java push notifications library for Android and Java applications. It acts as a client to the Meteor COMET web server. Deacon was created with the goal to bring a solid push notification platform to Android, and to enable developers to push-enable their apps without being dependent on anyone else's servers.

• Deacon Project Blog
• Deacon's source code repository at GitHub
• Deacon Project mailing list
• Video: Push-enabling your app with Deacon (4 minutes)

Droid-Fu offers both support classes meant to be used alongside existing Android code, as well as self-contained, ready-to-be-used components like new adapters and widgets.

The areas tackled by Droid-Fu include:

- application life-cycle helpers
- support classes for handling Intents and diagnostics
- better support for background tasks
- super-easy and robust HTTP messaging
- (remote) image handling and caching
- custom adapters and views

Droid fu repository

Library to communicate with Drupal services.

http://github.com/skyred/DrupalCloud

The TTS library for Android (Text-To-Speach)

http://code.google.com/p/eyes-free/

Flurry is a leading smartphone application analytics and monetization platform used by more than 30,000 applications across iOS, Android, Blackberry and J2ME. Each month, Flurry tracks over three billion end user application sessions per month.

Flurry Analytics helps developers make better applications, increase retention and grow revenue. Flurry AppCircle is an intelligent, analytics-powered cross-selling network that accelerates user acquisition for promoters and meaningfully monetizes applications for publishers.

www.flurry.com

This library is just here to help the Android application development. It have those objectives :
- Prevent loosing time at copying the same snippets of code over and over again.
- Try to make Android applications alike.
- Help developers to code highly functional applications.
- Leverage the power of the Android framework.
- Use as much XML as possible.

For more information :
http://android.cyrilmottier.com/?p=240

JSON marshaller/unmarshaller for Java that runs on Android

http://fisheye.codehaus.org/browse/jackson/

A video game framework for rapid game prototyping, partly modeled after Britt Hannah's article Object-Oriented Game Design.
http://code.google.com/p/juicygames/

Add fully functional custom offline maps to your Android apps in minutes

http://mapp.android-libraries.com

Mobile Maps provides developers with a simple way of adding map functionality to your mobile phone applications. It also includes access to the map data itself, from either TeleAtlas or OpenStreetMap depending on which data suits your application needs.

https://labs.ericsson.com/apis/mobile-maps/

MoVend is an in-app commerce platform which allows users to make payment within an application. Developers can integrate MoVend into their applications and start monetizing. This solution is provided for developers, publishers and operators who want to have a payment system inside their application, without the hassle of creating one. MoVend works as a payment aggregator, connecting the developers and their users. SDK is free for download once you signed up for a developer account at https://movend.com

Create Android GUI in more efficient way.

ObjectForms leverage Java class introspection to build user interface for your live objects, eliminating the need to write glue code. Relying on Java and Object Oriented principles means UI code can be reused and extended even if it grows complex, which is difficult if you do your layouts in XML.

http://www.objectforms.com

The OpenSocial Java Client Library enables you to work with OpenSocial data on your server, in the language of your choice. Includes description for android.

http://code.google.com/p/opensocial-java-client/

Android version of the computer vision library OpenCV.

http://billmccord.github.com/OpenCV-Android/

Qualcomm has published some librairies that could be really interesting :
Looking to optimize your app’s performance? Want to expand your development capabilities? We’ve built these tools for developers who want more out of our chips, so use them to take your app to the next level. And we have more on the way, so watch this space.

ALLJOYN P2P TOOLS

AllJoyn SDK

AllJoyn technology allows developers to create viral and social apps with connectivity across devices via ad hoc, peer networks.

ADRENO GRAPHICS OPTIMIZATION TOOLS

Ikivo IDE & Animator

The IKIVO IDE provides a complete tooling solution for developing, debugging and testing mobile applications based on the open standard Mobile SVG and JavaScript. Use the IKIVO Animator create animations, user interfaces, multimedia messages, and much more.

Adreno™ SDK

Download this first! The Adreno SDK is the first thing you’ll need when working with OpenGL ES. OpenGL ES desktop emulation libraries, sample code, tutorials, demos, documentation, and miscellaneous tools.

Adreno™ Profiler

Provides optimization, per-frame analysis and real-time performance counter visualization.

AUGMENTED REALITY TOOLS

AR SDK

The Qualcomm Augmented Reality Platform provides developers the ability to create high-performance Android applications with C++ APIs.

You can find all those librairies here :
http://developer.qualcomm.com/dev/android/tools

RESTProvider handles all the HTTP querying and caching. Users can seamlessly interface with any Web Service API which provides JSON or XML as a response. To query a RESTProvider in an activity a user need only specify an endpoint and then query an APIs RESTful functions.

http://github.com/novoda/RESTProvider

The android app 'Path' has a very attractive action menu sitting on the left bottom corner of the screen. Satellite Menu is the open version of this menu. For the ones who didn't see path, the menu consists of a main button on the left bottom of the screen. When the user clicks on this button, a number of buttons are popped out of this button.

https://github.com/siyamed/android-satellite-menu/

SocialLib aims to make the development of Social apps much more easier. Currently, Social Lib provides access to the following social networks : Facebook, Twitter, Google Buzz, LinkedIn.

http://androidlibs.com/sociallib.html

Spring Android is an extension of the Spring Framework that aims to simplify the development of native Android applications.
Contains a Rest Client, a Commons Logging adapter

http://www.springsource.org/spring-android

Charting library for Android, provides a CHART Intent to return a picture of your custom data.

http://www.steema.com
https://market.android.com/details?id=com.steema.teechart.android

final Intent intent = new Intent("com.steema.teechart.android.CHART");
intent.setType("text/*");
intent.putExtra("Header", "Hello World !");
intent.putExtra("Style", "Bar");
intent.putExtra("Text", new String[] { "Apples", "Bananas", "Kiwis" });
intent.putExtra("Values", new double[] { 45, 23, 12 });

public void onActivityResult(int requestcode, int resultcode, Intent intent) {
if (resultcode == RESULT_OK)
final Bitmap bitmap = ChartIntent.getChart(requestcode, intent);
}

TeeChart provides complete, quick and easy to use charting .NET, Java, ActiveX / COM, PHP and Delphi VCL controls for business, Real-time, Financial and Scientific applications.
Full source code available, visit us at www.steema.com

TeeChart for Java v.2 Charting component Library ships with 100% sourcecode in Android, AWT/Swing and SWT formats. It supports major Java programming environments including IBM Eclipse, Sun NetBeans, IntelliJ IDEA and Oracle JDeveloper.

The charting library offers 50 Java Chart styles (in 2D and 3D plus multiple combinations), 38 mathematical functions and 20 Chart tools components for additional functionality including dragging of series marks, annotation objects, cursors and manual trend lines, coloring bands, etc.

Charting styles:

Line (Tape), Points (Scatter XY and XYZ 3D Scatter), Area (Stacked and negative), FastLine (real-time speed), Horizontal Line, Bar and Horizontal Bar (Stacked and negative), Pie (Exploded, partial angle), Shape (Cube, Pyramid, Cylinder, etc), Arrow (Callout), Bubble, Gantt, Candle (Finantial OHLC High-Low), Donut (Exploded Doughnut), Volume (Stock), Bar 3D, Points 3D, Polar, Radar, Clock, WindRose, Pyramid, Surface (XYZ Grid Mesh), LinePoint, BarJoin.class, ColorGrid, Waterfall, Histogram, Error, ErrorBar, Contour (Contouring Levels), Smith, Calendar, HighLow, TriSurface (Voronoi triangulation of arbitrary XYZ points), Funnel, Box (Box Whisker), Horizontal Box, Horizontal Area, Tower, Point and Figure, Gauges, Vector 3D, Map (Mapping GIS), Bezier, Bar with Image, IsoSurface (Auto Leveled XYZ Mesh), Circular Gauge, Linear Gauge, Vertical Linear Gauge, Horizontal Histogram.

Feature Summary:

50 Chart styles (in 2D and 3D plus multiple combinations) including Gauges
38 mathematical functions
100% sourcecode for Android, AWT/Swing and SWT
Run-time Editor, Gallery dialogs
20 Chart Tool components for additional functionality, like dragging series marks, annotation objects, cursors and manual trend lines, coloring bands, etc
Chart Grid component to manage data
Multiple-axis support both horizontal and vertical
Customisation of axis labels and legend items
Great cosmetic properties for all texts and drawings
Complete set of chart styles, both in 2D and 3D
Live and animated zoom and scroll. Multi-touch and mouse wheel supported
2D and 3D
Custom drawing canvas
Extensive demos
Design and runtime integrated Chart and Series editor
New improved Javadoc format help plus Tutorials
Many new visual features, transparency, colour gradients, gray-scale.

Mathematical and statistical functions:

Add, Subtract, Multiply, Divide, High, Low, Average, Count,
Momentum, Momentum Division, Cumulative, Exponential Average, Smoothing, Custom User Defined, Root Mean Square,
Standard Deviation (StdDeviation), Stochastic, Exponential Moving Average, Performance, CrossPoints, Compress OHLC,
CLV, OBV, CCI, Moving Average, PVO, DownSampling, Trend, Correlation, Variance, Perimeter, CurveFitting,
ADX, Bollinger, MACD, SAR, RSI, Histogram Function.

Library with activities to connect with Twitter and Demo Twitter Project

https://github.com/brione/Brion-Learns-OAuth

A very thin yet complete xmlrpc client side library for Android platform.

http://code.google.com/p/android-xmlrpc/