WEKA - WEKA is a set of powerful data mining tools that run on Java.
Apache Mahout - Distributed Linear Algebra
Orange - Machine learning for novice and experts.
KNIME - KNIME, the open platform for your data.
RapidMiner - RapidMiner is a software platform for data science teams that unites data prep, machine learning, and predictive model deployment.
Wanderfile - If you love to travel, and want to keep track of where you have been, then Wanderfile is the app for you.