Osdag is a cross-platform free and open-source software for the design (and detailing) of steel structures, following the Indian Standard IS 800:2007. It allows the user to design steel connections, members and systems using a graphical user interface. The interactive GUI provides a 3D visualisation of the designed component and creates images for construction/fabrication drawings. The design is typically optimised following industry best practices. In the preliminary stages, Osdag's development focuses mainly on connection designs. Osdag is primarily built upon Python other Python-based FOSS tools, such as, PyQt, OpenCascade, and PythonOCC. It uses SQLite for managing steel section databases. Osdag is currently under development. An alpha version of Osdag containing a few connection design modules is expected to be released in December, 2016.