Geomajas is a web mapping GIS software with full vectorial editing capabilities, and support for custom attribute relation models in the browser. It has built-in support for any type of query, selection, filtering, snapping, printing, ...
HidroSIG is a GIS that supports raster and vectorial maps with modules oriented to the hydrological analysis, time series, remote sensing and more. It has been made 100% in java using VisAD for data visualization and using MySQL to storage all data.