Não consigo pensar em algo melhor do que inkscape .
O Inkscape é um editor de gráficos vetoriais de código aberto semelhante ao Adobe Illustrator, Corel Draw, Freehand ou Xara X. O que diferencia o Inkscape é o uso de Scalable Vector Graphics (SVG), um W3C baseado em XML aberto padrão, como o formato nativo.
Você pode instalá-lo usando o comando:
sudo apt-get install inkscape
Dê uma olhada no este link para dicas de como otimizar o SVG usando o inkscape.
para comamnd line Eu acho que você deveria dar uma olhada para limpar
scour --help
scour 0.26
Copyright Jeff Schiller, Louis Simard, 2010
Usage: scour [-i input.svg] [-o output.svg] [OPTIONS]
If the input/output files are specified with a svgz extension, then compressed
SVG is assumed. If the input file is not specified, stdin is used. If the
output file is not specified, stdout is used.
Options:
--version show program's version number and exit
-h, --help show this help message and exit
--disable-simplify-colors won't convert all colors to #RRGGBB format
--disable-style-to-xml won't convert styles into XML attributes
--disable-group-collapsing won't collapse <g> elements
--create-groups create <g> elements for runs of elements with
identical attributes
--enable-id-stripping remove all un-referenced ID attributes
--enable-comment-stripping remove all <!-- --> comments
--shorten-ids shorten all ID attributes to the least number of
letters possible
--disable-embed-rasters won't embed rasters as base64-encoded data
--keep-editor-data won't remove Inkscape, Sodipodi or Adobe
Illustrator elements and attributes
--remove-metadata remove <metadata> elements (which may contain
license metadata etc.)
--renderer-workaround work around various renderer bugs (currently
only librsvg) (default)
--no-renderer-workaround do not work around various renderer bugs
(currently only librsvg)
--strip-xml-prolog won't output the <?xml ?> prolog
--enable-viewboxing changes document width/height to 100%/100% and
creates viewbox coordinates
-p DIGITS, --set-precision=DIGITS
set number of significant digits (default: 5)
-q, --quiet suppress non-error output
--indent=INDENT_TYPE indentation of the output: none, space, tab
(default: space)
--protect-ids-noninkscape Don't change IDs not ending with a digit
--protect-ids-list=PROTECT_IDS_LIST
Don't change IDs given in a comma-separated list
--protect-ids-prefix=PROTECT_IDS_PREFIX
Don't change IDs starting with the given prefix
Veja também esta pergunta SE . ajuda.