rsvg-convert
$ sudo apt-get install librsvg2-bin $ rsvg-convert -f pdf -o mygraph.pdf mygraph.svgImageMagick
$ sudo apt-get install imagemagick $ convert mygraph.svg mygraph.pdfInkscape
$ sudo apt-get install inkscape $ inkscape mygraph.svg --export-pdf=mygraph.pdf
A few others include
GhostPDL and CairoSVG. Each of these tools has its own limitations, particularly, supported SVG features. My limited use points to that Inkspace appears to have the most supported features.