High Quality Content by WIKIPEDIA articles! Rich Ajax Platform (RAP) Project is an open-source software project under the Eclipse Technology Project which aims to enable software developers to build Ajax-enabled rich Internet applications by using the Eclipse development model, plugins and a Java-only application programming interface (API). It can be considered a counterpart for web development to the Rich Client Platform (RCP). The API is very similar to RCP so developers who know RCP can reuse extant knowledge. RAP encourages sharing source code between RCP and RAP applications to reduce the development effort for business applications that need both desktop-based and web-based front ends.