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The Waikato Environment for Knowledge Analysis (WEKA), a machine learning workbench. This version represents the developer version, the "bleeding edge" of development, you could say. New functionality gets added to this version.
The newest version!
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KnowledgeFlow GUI Quick Primer
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What's new in the KnowledgeFlow:

The KnowledgeFlow has undergone a major UI overhaul in Weka 3.7.4. New
features include:

* Move from tabbed toolbars of components to a tree
* Multiple flow layouts (each in its own tab)
* New icons for general controls
* Support for cut, copy, paste and delete of multiple components
* "Save as" as well as "Save"
* Informational notes can now be added to the layout
* Undo buffer
* "Select all" button
* Drag multiple components
* Snap-to-grid
* New buttons to run flow in parallel mode (all data sources launched simultaneously) 
  and sequential mode (data sources launched one after the other in an order 
  specified by the user)
* Template flows demonstrating example learning processes
* Plugin "perspectives" that allow additional functionality to take over
  the main UI

Introduction:

The KnowledgeFlow provides an alternative to the Explorer as a
graphical front end to Weka's core algorithms. It presents a
"data-flow" inspired interface to Weka. The user can select Weka
components from a pallete, place them on a layout canvas and connect
them together in order to form a "knowledge flow" for processing and
analyzing data. At present, all of Weka's classifiers, filters,
clusterers, loaders and savers are available in the KnowledgeFlow
along with some extra tools.

The KnowledgeFlow can handle data either incrementally or in batches
(the Explorer handles batch data only). Of course learning from data
incrementally requires a classifier that can be updated on an instance
by instance basis. There are a number of schemes that can handle data
incrementally: NaiveBayesUpdateable, IB1, IBk, LWR (locally weighted
regression), SGD, SPegasos, Cobweb and RacedIncrementalLogitBoost.

Features of the KnowledgeFlow:

* intuitive data flow style layout
* process data in batches or incrementally 
* process multiple batches or streams in parallel! (each separate flow 
  executes in its own thread). Alternatively, multiple streams can be
  executed sequentially, in a user-specified order
* chain filters together
* view models produced by classifiers for each fold in a cross validation
* visualize performance of incremental classifiers during 
  processing (scrolling plots of classification accuracy, RMS error, 
  predictions etc)
* access additional non flow-based functionality through plugin 
  "perspectives"

Components available in the KnowledgeFlow:

DataSources:
  All of Weka's loaders are available

DataSinks:
  All of Weka's savers are available

Filters:
  All of Weka's filters are available

Classifiers:
  All of Weka's classifiers are available

Clusterers:
  All of Weka's clusterers are available

Evaluation:
  TrainingSetMaker - make a data set into a training set
  TestSetMaker - make a data set into a test set
  CrossValidationFoldMaker - split any data set, training set or test set
    into folds
  TrainTestSplitMaker - split any data set, training set or test set into
    a training set and a test set
  ClassAssigner - assign a column to be the class for any data set, training
    set or test set
  ClassValuePicker - choose a class value to be considered as the "positive"
    class. This is useful when generating data for ROC style curves (see
    below)
  ClassifierPerformanceEvaluator - evaluate the performance of batch
    trained/tested classifiers
  IncrementalClassifierEvaluator - evaluate the performance of incrementally
    trained classifiers
  ClustererPerformanceEvaluator - evaluate the performance of batch
    trained/tested clusterers
  PredictionAppender - append classifier predictions to a test set. For
    discrete class problems, can either append predicted class labels or
    probability distributions
  SerializedModelSaver - save a classifier out to a file for later use.

Visualization:
  DataVisualizer - component that can pop up a panel for visualizing data in
    a single large 2D scatter plot
  ScatterPlotMatrix - component that can pop up a panel containing a matrix of
    small scatter plots (clicking on a small plot pops up a large scatter 
    plot)
  AttributeSummarizer - component that can pop up a panel containing a matrix
    of histogram plots - one for each of the attributes in the input data
  ModelPerformanceChart - component that can pop up a panel for visualizing
    threshold (i.e. ROC style) curves.
  TextViewer - component for showing textual data. Can show data sets, 
    classification performance statistics etc.
  GraphViewer - component that can pop up a panel for visualizing tree based
    models
  StripChart - component that can pop up a panel that displays a scrolling
    plot of data (used for viewing the online performance of incremental
    classifiers)
  CostBenefitAnalysis - interactively and graphically explore the effects 
    of changing costs/benefits and adjusting prediction thresholds.


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Launching the KnowledgeFlow:

The Weka GUI Chooser window is used to launch Weka's graphical
environments. Select the button labeled "KnowledgeFlow" to start the
KnowledgeFlow. Alternatively, you can launch the KnowledgeFlow from a
terminal window by typing "java weka.gui.beans.KnowledgeFlow".

EXAMPLE:
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Setting up a flow to load an arff file (batch mode) and
perform a cross validation using J48 (Weka's C4.5 implementation). NOTE,
this example ("Cross validation") can be accessed from the Templates 
button (third in from the right in the toolbar) in the KnowledgeFlow
UI.

First start the KnowlegeFlow.

Next expand the DataSources entry in the tree and choose "ArffLoader"
from the toolbar (the mouse pointer will change to a "cross hairs").

Next place the ArffLoader component on the layout area by clicking
somewhere on the layout (A copy of the ArffLoader icon will appear on
the layout area).

Next specify an arff file to load by first right clicking the mouse
over the ArffLoader icon on the layout. A pop-up menu will
appear. Select "Configure" under "Edit" in the list from this menu and
browse to the location of your arff file. Alternatively, you can
double-click on the icon to bring up the configuration dialog (if
the component in question has one).

Next expand the "Evaluation" entry in the tree and choose the
"ClassAssigner" (allows you to choose which column to be the class)
component from the toolbar. Place this on the layout.

Now connect the ArffLoader to the ClassAssigner: first right click
over the ArffLoader and select the "dataSet" under "Connections" in
the menu. A "rubber band" line will appear. Move the mouse over the
ClassAssigner component and left click - a red line labeled "dataSet"
will connect the two components.

Next right click over the ClassAssigner and choose "Configure" from
the menu. This will pop up a window from which you can specify which
column is the class in your data (last is the default).

Next grab a "CrossValidationFoldMaker" component from Evaluation
and place it on the layout. Connect the ClassAssigner to the
CrossValidationFoldMaker by right clicking over "ClassAssigner" and
selecting "dataSet" from under "Connections" in the menu.

Next expand the "Classifiers" entry in the tree, then the "trees"
sub-entry and select the "J48" component. Place it on the layout.

Connect the CrossValidationFoldMaker to J48 TWICE by first choosing
"trainingSet" and then "testSet" from the pop-up menu for the
CrossValidationFoldMaker.

Next go back to the "Evaluation" entry and place a
"ClassifierPerformanceEvaluator" component on the layout. Connect J48
to this component by selecting the "batchClassifier" entry from the
pop-up menu for J48.

Next expand the "Visualization" entry and place a "TextViewer"
component on the layout. Connect the ClassifierPerformanceEvaluator to
the TextViewer by selecting the "text" entry from the pop-up menu for
ClassifierPerformanceEvaluator.

Now start the flow executing by pressing the blue "play" icon at the
top-left of the display. Progress information for the executing
components willa appear in the "Status" area and "Log" at the bottom
of the window.

When finished you can view the results by choosing show results from
the pop-up menu for the TextViewer component.

Other cool things to add to this flow: connect a TextViewer and/or a
GraphViewer to J48 in order to view the textual or graphical
representations of the trees produced for each fold of the cross
validation (this is something that is not possible in the Explorer).
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