WActiviti (software)
WApache Ant
WApache Batik
WApache Cayenne
WApache Nutch
WApache OODT
WApache OpenNLP
WApache Shiro
WApache Tika
WApache Wink
WApache Xalan
WApache Xerces
WApache Yetus
WJMonkeyEngine
WGNU Classpath
WFlying Saucer (library)
WH2 (DBMS)
WImageJ
WJava OpenGL
WJDOM
WJMonkeyEngine
WJUNG
WLightweight Java Game Library
WStableUpdate
WStandard Widget Toolkit
WSwing (Java)
WVaadin
WVisualAp