Readium.org: Open Source Technology for EPUB 3 and the Open Web Platform The Readium Foundation (Readium.org) develops technology to accelerate adoption of EPUB 3 and the Open Web Platform by the global digital publishing industry. Readium.org was formed in February, 2013 as a non-profit memebership organization. Current Readium.org projects include Readium Web (an EPUB 3 rendering engine for browser-based cloud readers) and Readium SDK (an EPUB 3 rendering engine for native apps).