. . . "VRR"@en . "VRR (a Vector-based gRaphic editoR) is a free and open source vector graphics editor application designed especially for creating illustrations of mathematical articles.VRR has a simple but powerful operation set: creating, manipulating and transforming basic graphic primitives, which are points, segments, rational B\u00E9zier curves, elliptic arcs etc."@en . "9.0.4" .