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UJAC is a collection of Java components that may be useful for your project. It provides a powerful expression interpreter, a iText based document processing engine that generates PDF documents based on XML templates, a charting library and much more.
iText is a free open source Java-PDF library released on SF under the MPL/LGPL; iText comes with a simple GUI: the iText toolbox. The original developers of iText want to publish this toolbox as a separate project under the more permissive MIT license.
Small tool that creates a PDF file with thumbnails of all images in a folder. The number of thumbnails per page along with some other settings can be adjusted. Jpg2Pdf uses the iText library for pdf-generating.
PDF Annot is a piece of software that enables you to add audio and text annotation to a PDF. It uses JPedal SimpleViewer and iText library. Annotations are supported by Adobe'sofficial PDF Reader. Report any bug here: krakosia[at]gmail.com
Uranograph is a set of classes and methods written in Java for generating printable and viewable star charts based on different data sources. Currently the Lambert azimuthal equal-area projection is implemented. Output in SVG and PDF (with iText library)