SourceForge presents the Amazon Mechanical Turk SDK for Java project. Amazon Mechanical Turk SDK for Java is an open source application. SourceForge provides the world's largest selection of Open Source Software. The Amazon Mechanical Turk SDK for Java is a set of libraries and tools designed to make it easier for you to build solutions leveraging Amazon Mechanical Turk (MTurk, MechTurk).
PyBossa is a free, open-source, platform for creating and running crowd-sourcing applications that utilise online assistance in performing tasks that require human cognition, knowledge or intelligence such as image classification, transcription, geocoding and more!
Bossa is an open-source software framework for distributed thinking - the use of volunteers on the Internet to perform tasks that use human cognition, knowledge, or intelligence.
PsiTurk is an open platform for conducting custom behvioral experiments on Amazon's Mechanical Turk.
It is intended to provide most of the backend machinery necessary to run your experiment. It uses AMT's External Question HIT type, meaning that you can collect data using any website. As long as you can turn your experiment into a website, you can run it with PsiTurk!