uDig Javadocs
The javadocs for the current stable release of uDig are published here:
GeoAPI API
The GeoAPI project publishes their latest javadocs here:
These interfaces are available in their Java 5.0 form. We do not make complete use of the GeoAPI interfaces, only the portion for which open source implementations have been made available.
GeoTools API
The GeoTools toolkit publishes their latest javadocs here: