GFViewer draws round-capped chromosome ideograms with each gene family in its own colour and computes localization statistics (sub-telomeric bias, tandem arrays, 1-D Ripley's K/L, chromosome enrichment, multigene-family hotspots, family-proximity clustering, ...). Reads annotation tables, BED, GFF3 and GTF. Provides the gfviewer command-line tool.