The only program that can reliably work with .idml and .indd files, would be Adobe InDesign from which both of these files originate. It is unlikely that you can find any other program that can perform idml to indd conversion, as InDesign formats are fairly closed.
Convert InDesign Markup Language document to Adobe InDesign document.
We found 2 software records in the database related to .idml to .indd file format conversion.
Microsoft Windows software - convert idml to indd on Windows
Professional desktop document publishing software from Adobe
Convert from idml file format
|Yes, Adobe InDesign supports indd file conversion as a target file type.||Yes||Yes||indd editor||Yes||No||No||No|
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 idml to indd. 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.
Apple macOS / Mac OS X software - convert idml to indd on OS X
Mac version od Adobe's popular document designing and publishing software