Colaboratory is a Chrome App developed by a joint team consisting of Google Research, Matthew Turk, and the IPython/Jupyter. It works like a Jupyter notebook. Colaboratory merges many open source packages with Google technologies which facilitates collaboration and reduces the burden of setting up the working environment.
To check what packages Colaboratory has, I have done a simple test by importing packages. Here is what I found.
Data Processing Packages. Four commonly used data processing/analysis packages like numpy and pandas come in handy
Visualization Packages. I have tested four packages and three of them are available. The one tested but not found is Bokeh.
Machine Learning Packages. I have tested five common python machine learning packages and two of them are available. Theano, Caffe and XGBoost are not available.
Image Processing Packages. Two packages Pillow and Skimage are available. OpenCV, one of my favorite packages is not available.
Natural Language Processing Packages. Only NLTK was tested and it is available.
Packages do not exist
Please check the notebook for detailed information.