weka.classifiers
Interfaces 
IterativeClassifier
Sourcable
UpdateableClassifier
Classes 
AdaBoostM1
AdditiveRegression
AttributeSelectedClassifier
Bagging
BVDecompose
CheckClassifier
ClassificationViaRegression
Classifier
CostMatrix
CostSensitiveClassifier
CVParameterSelection
DecisionStump
DecisionTable
DistributionClassifier
DistributionMetaClassifier
Evaluation
FilteredClassifier
HyperPipes
IB1
IBk
Id3
KernelDensity
LEM2
LinearRegression
Logistic
LogitBoost
LWR
MetaCost
MultiClassClassifier
MultiScheme
NaiveBayes
NaiveBayesSimple
OneR
Prism
RegressionByDiscretization
RuleClassifier
SMO
Stacking
ThresholdSelector
UserClassifier
VFI
VotedPerceptron
Voter
ZeroR