weka.clusterers
Interfaces 
ActiveLearningClusterer
SemiSupClusterer
Classes 
AlgVector
Cluster
Clusterer
ClusterEvaluation
Cobweb
DistributionClusterer
DistributionMetaClusterer
EM
FarthestFirst
HAC
InstancePair
MPCKMeans
PCKMeans
PCSoftKMeans
SeededKMeans
Seeder
SemiSupClustererEvaluation
SimpleKMeans
XMeans