This frame design is very easy to draw because it is symmetrical; it is enough to draw a 45-degree segment only, and the whole pattern is obtained either with mirror copying or a combination of mirror and rotary copying.
To modify this Art Nouveau frame design you will need vector editing (Adobe Illustrator, Inkscape, CorelDraw..) or 2D CAD software (AutoCAD, QCAD, NanoCAD, Solid edge 2D Drafting...).