Guillaume Savaton released source code of Sozi — an extension for Inkscape that allows creating animations using SVG and JavaScript.

While it doesn't solve the need for prime time SVG animation authoring tool, it does help creating things like good looking presentations.

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More on this topic:

• UniConvertor 1.1.5 review
• 2D vector animation editor Synfig 0.63.02 released
• Synfig Studio gets advanced outline features, revisits Inkscape compatibility
• Mesh gradients accepted to SVG 2.0, initially supported by Inkscape
• Tupi animation editor gets collaborative drawing