Dear @Lukas-jd,
Thank you for your interest in our softwatr.
CRYSTAL has been successfully applied to study organic crystals. Here are a few examples:
https://pubs.acs.org/doi/full/10.1021/acs.jctc.6b00304
https://www.sciencedirect.com/science/article/pii/S0022286020310462?via%3Dihub
https://pubs.rsc.org/en/content/articlelanding/2020/CE/D0CE01016B