Conversion of vsdx files to odg file format

Latest versions of LibreOffice can open and import MS Visio drawings (.vsd, .vsdx etc.) just fine and you can use the LibreOffice Draw program to re-save the diagram to OpenDocument ODG format. You can download the suit for free, so this seems to be the easiest and most convenient way.

Open VSDX file    Open ODG file

Related software

Apache OpenOffice Draw icon

Apache OpenOffice Draw

Graphic editor for diagrams and simple graphics from OpenOffice.org suite

Inkscape icon

Inkscape

A vector graphics editor

LibreOffice Draw icon

LibreOffice Draw

Graphic and diagram software from LibreOffice suite