OOReader is a free app for viewing ODF documents (Writer, Calc, Impress, ) created with OpenOffice or LibreOffice. The supported file types are: Text Document (ODT, OTT, ODM, SDW, STW, SXW). Spreadsheet (ODS, OTS, SDC, STC, SXC). Presentation (ODP, OTP, SDD, SDP, STI, SXI). Drawing (ODG, OTG, SDA, SXD). Formula (ODF). Word (DOC, DOT, DOCX, DOTX). Excel (XLS, XLT, XLSX, XLTX).