Maintainers for opencascade are Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>.
You may want to refer to the following individual bug pages: libocct-data-exchange-7.3, libocct-data-exchange-7.5, libocct-data-exchange-7.6, libocct-data-exchange-7.6t64, libocct-data-exchange-7.8, libocct-data-exchange-dev, libocct-doc, libocct-draw-7.3, libocct-draw-7.5, libocct-draw-7.6, libocct-draw-7.6t64, libocct-draw-7.8, libocct-draw-dev, libocct-foundation-7.3, libocct-foundation-7.5, libocct-foundation-7.6, libocct-foundation-7.6t64, libocct-foundation-7.8, libocct-foundation-dev, libocct-modeling-algorithms-7.3, libocct-modeling-algorithms-7.5, libocct-modeling-algorithms-7.6, libocct-modeling-algorithms-7.6t64, libocct-modeling-algorithms-7.8, libocct-modeling-algorithms-dev, libocct-modeling-data-7.3, libocct-modeling-data-7.5, libocct-modeling-data-7.6, libocct-modeling-data-7.6t64, libocct-modeling-data-7.8, libocct-modeling-data-dev, libocct-ocaf-7.3, libocct-ocaf-7.5, libocct-ocaf-7.6, libocct-ocaf-7.6t64, libocct-ocaf-7.8, libocct-ocaf-dev, libocct-visualization-7.3, libocct-visualization-7.5, libocct-visualization-7.6, libocct-visualization-7.6t64, libocct-visualization-7.8, libocct-visualization-dev, occt-draw, occt-misc.
You might like to refer to the opencascade package page, or to the Package Tracking System.
If you find a bug not listed here, please report it.