You can export ODG drawing to common PNG image using the export or save as function in OpenOffice Draw or Libre Office Draw programs. Some online converting services might also be able to perform the conversion.
Convert OpenDocument drawing to Portable Network Graphic.
We have found 2 software records in our database eligible for .odg to .png file format conversion.
Multiplatform software - convert odg to png on any platform
Graphic editor for diagrams and simple graphics from OpenOffice.org suite
Convert from odg file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned odg to png. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Graphic and diagram software from LibreOffice suite