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GWTUpload is a library for uploading files to web servers, showing a progress bar with real information about the process (file size, bytes transferred, etc). It uses ajax requests to ask the web server for the upload progress. It has two components written in java, the server side with servlet and utility classes, and the client side that is compiled into javascript using gwt. GWTUpload-gae is a library with aditional classes needed for using GwtUpload in Google Application Engine (GAE). JSUpload is the client library but compiled and exported into javascript, so users without Gwt skills can use it directly in their web pages. It includes a bunch of useful examples to learn how to use the library and see its features.

GroupDocs.Viewer is an online document viewer that lets you read documents in your browser, regardless of whether you have the software that they were created in. You can view many types to word processing documents (DOC, DOCX, TXT, RTF, ODT), presentations (PPT, PPTX), spreadsheets (XLS, XLSX), portable files (PDF), and image files (JPG, BMP, GIF, TIFF). For each file, you get a high-fidelity rendering, showing the document just as it would if you opened it in the software it was created in. Layout and formatting is retained and you see an exact copy of the original. GroupDocs.Viewer lets you really read the document. You can search text documents, copy text and even embed the document – GroupDocs.Viewer and all - in a web page. You can print or download the file from GroupDocs.Viewer if you need to work with it offline.