Hi,
Welcome to OpenGamma!
Over the last 18 months we have transitioned our development onto our next-generation toolkit for market risk, called Strata. This is designed to offer all the functionality at the core of OG-Platform in a much simpler and easier to use library. Strata is already in use in production, and we are in the process of updating our website to point visitors to this as the replacement for OG-Platform.
As you are just getting started, we would strongly recommend that you start with Strata. The source code is available at https://github.com/OpenGamma/Strata and detailed documentation is at http://opengamma.github.io/StrataDocs/.
Please let us know how you get on. If you would like to discuss your requirements further then don’t hesitate to get in touch.
Best wishes,
Jon