• Osdag main page
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  • Module design page showing input and output docks, log messages and 3D CAD model
  • Hands-on training session for AICTE college teachers at IIT Bombay
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  • 3D visualisation of designed components (beam splice with bolted cover plate)
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  • 3D model of the designed component viewed by closing the input and output docks
  • Designed component exported to AutoCAD for drafting
  • Detailed design report auto-generated in Osdag
  • Hands-on training session for working professionals at IIT Roorkee (GNEC)
  • Detailed design log providing error messages and suggestions
  • Hands-on training session for undergraduate students at SASTRA
  • Spacing details for bolted connection modules
  • slide 15

Introduction

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 an option to export the CAD model to any drafting software for the creation of construction/fabrication drawings. The design is typically optimised following industry best practices. Osdag is primarily built upon Python and other Python-based FLOSS tools, such as, PySide,  OpenCascade, PythonOCC, and PyLaTeX. It uses SQLite for managing steel section databases. Osdag is currently under development. The latest version released on the website is 2026.02.0.0.  This and all subsequent versions are available for downloading (for free) on the Downloads page.

 

Strictly follows IS code; design checking is very fast; and user interface is very easy to navigate. 
Rabindra Upreti
PhD Scholar, IIT Bombay

 

Simple user interference; presentation of results is good; and can download report even if design failed. 
Rakendu R
Assistant Professor Saintgits College of Engineering

 

Free of cost & visualization for steel structures.
Lalit Kumar Gupta
Assistant Professor, BMSIT&M

 

Very good for conceptual understanding of the connections; easy to understand for students; and the details of the design report.
Prasad Jadhav
Mtech Student, COEP Technological University

 
Fast Processing of Problems, Good UI, Detailed Report generation. 
Ashwini Kumar Singh B.Tech student, IIT Bombay
 
Less time consuming, log message feature is very useful, design report gives complete information about the design. 
Mullai VP BTech student, SoCE, SASTRA
 
The development of Osdag as a platform which helps in the design and detailing of steel structures will considerably help in moving towards the desired level of steel consumption in the construction industry. 
Prof. SR Satish Kumar Professor, IIT Madras
 
The students ... are appreciative of the efforts of your team and FOSSEE to provide such a free and user friendly (and desi !) steel design tool. 
Prof. Raghavan R SoCE, SASTRA
 
An initiative like Osdag is, in my opinion, bridging the gap between student and professionals in the field of connection design, following IS 800 : 2007. … Interpreting the critical aspects of the code into a simple, user friendly platform, i.e. Osdag, should benefit all concerned parties. 
Somnath Mukherjee Chief Engineer, MN Dastur & Company (P) Ltd
 
Osdag is one such software that is easy to learn. The difficulties in steel design are completely eliminated. Thank you for making know us about this software. 
S. Saisree BTech student, SoCE, SASTRA
 
[Osdag] must be added to curriculum, so that everyone can learn. 
Prof. Vipul Vyas CS Patel Inst. of Tech.
 
 
INSDAG feels fortunate to be a part of the process in the development of the open source software named Osdag … and looks forward to continue its association and contribute effectively to the project. 
Sushim Banerjee Director General, INSDAG