There are many cloud-based services that integrate Magento with other platforms (shipping solutions, marketplaces, accounting, etc.). The options for CS-Cart integrations are much more limited. What if it was possible to masquerade CS-Cart as Magento using some type of API middleware that maps Magento calls to CS-Cart? Has anyone pursued this?
Try to contact Alt-Team. As far as I know, they work both with Magento and CS-Cart