We have found 5 software records in our database eligible for .cgm to .png file format conversion.
cgm to png conversion is a matter of export of graphics content between Computer Graphics Metafile format (CGM) and standard PNG graphics. CGM format might be either vector or raster, but in both cases of PNG export the output will be just bitmap.
Except for Corel software that supports .cgm files for decades, you can certainly find other graphics editors that can handle CGM format. Inkscape for example is popular (and free) vector graphics software, so definitely worth a shot.
CGM
Files with cgm extension can be typically found as graphics files in Computer Graphics Metafile format. It is used for 2D vector graphics, raster graphics, and text, and is defined by ISO/IEC 8632. All graphical elements can be specified in a textual source file that can be compiled into a binary file or one of two text representations.
PNG
Files with png extensions are commonly used for Portable Network Graphic files. PNG is a bitmap image mainly used on web pages.