There is a strong desire to bring together EDA tools and design views into a single tightly integrated next generation web-platform which can be deployed on the cloud. We present details of the software architecture of how legacy standalone EDA tools (including ones with rich graphical interfaces) can be evolved into on-demand web-servers running on an internal cloud, providing a rich set of web APIs, to build such web platforms. Experimental evaluation of the methodology to develop NEXA Logic WorkBench, using a legacy logic debugger tool, internal server grid, and other web solutions, demonstrates the applicability of the proposed approaches.