officeparser

A Node.js library to parse text out of any office file. Currently supports docx, pptx, xlsx, odt, odp, ods, pdf files.

aspose.slides.via.java

A powerful library for manipulating and converting PowerPoint (PPT, PPTX, PPS, POT, PPSX, PPTM, PPSM, POTX, POTM), ODP, ODS, CSV, TXT, PNG, EMF, JPG, JSON and HTML files.