RapidMiner - RapidMiner is a software platform for data science teams that unites data prep, machine learning, and predictive model deployment.
Freeplane - Freeplane is a powerful and free software for building mind maps.
KNIME - KNIME, the open platform for your data.
Linked Ideas - A macOS/iOS apps to treat ideas as links of concepts.
WEKA - WEKA is a set of powerful data mining tools that run on Java.
vym - VYM (View Your Mind) is a tool to generate and manipulate maps which show your thoughts.