ADE-4, short for Ecological Data Analysis 2004, is multifunctional multivariate analysis and graphical display software. Of particular interest here is its spatial data analysis capabilities, which include classical tools for spatial structure analysis, like Ripley's function, as well as a new method to analyze the spatial structure of heterogeneous point patterns. In addition, it works with arbitrarily shaped study regions (see also Programita). Available for the Mac and PC.