Ruby Cloud SDK & REST APIs to build apps for rendering & viewing images, HTML, PDF, Word, Excel, Email, Visio, Project & CAD file formats....XLSB, XLTX, XLTM PowerPoint: PPT, PPTX, PPS, PPSX, PPSM, PPTM...Office: DOC, DOCX, XLS, XLSX, PPT, PPTX PDF Images: JPG, PNG, BMP...