1) The community is open to the public: http://www.sdn.sap.com/irj/scn/index http://www.sdn.sap.com/irj/scn/index -> Not a member? -> Public User 2) The main pl

1) The community is open to the public: http://www.sdn.sap.com/irj/scn/index http://www.sdn.sap.com/irj/scn/index -> Not a member? -> Public User 2) The main platform can be downloaded here: http://www.sdn.sap.com/irj/scn/nw-downloads http://www.sdn.sap.com/irj/scn/nw-downloads -> Choose a developer edition Application Server. You can also find and download a trial of gateway, (mobile platform) business objects, (analytic) etc if you look around. I'm actually not so familiar with whats actively available these days. 3) johnappleby is probably better qualified to answer this question at this point but I will tell you to look into SAPlink since its considered the "open source enabler" of SAP http://code.google.com/p/saplink/ http://code.google.com/p/saplink/ you can also check out the enterprise geeks, good light-hearted site for SAP content http://enterprisegeeks.com/blog/projects/ http://enterprisegeeks.com/blog/projects/ I built a framework for integrating data between SAP's cloud offering and their on premise solutions but after unsuccessfully trying to opensource it in collaboration with SAP (a frustrating experience) I pretty much stopped my community activities. That experience sucked a lot of the SAP enthusiasm out of me but I have watched the company get much better over the last 2 years and I am in talks about getting involved in an another open source project sometime in the next few months.