We aim to gather new and analyze existing phase-contrast and ttenuation-based CT data of the breast. The key focus is on developing a quantitative Breast Imaging Package (qBIP), an open-data software package that encompasses analysis algorithms, quantitative breast tissue properties, and raw and volumetric data from various BCT devices. We will establish a quantitative analysis pipeline using initial phase-contrast BCT scans of mastectomy samples and clinical attenuation-based BCT data. The derived breast tissue properties will also enable the creation of accurate breast phantoms for BCT imaging using our phase-contrast BCT systems. The analysis methods, breast tissue properties, and volumetric phantom datasets will be openly accessible in a machine-readable format through the qBIP repository, providing valuable tools for quantitative analysis and advancements in BCT while welcoming contributions from the research community.