Aspose.PDF FOSS for .NET ships with a rich set of annotation and form-field APIs that let you mark up, link, and interact with PDF documents entirely in managed code — no license key required. Annotations at a glance The library’s AnnotationCollection class provides typed helper methods for every standard PDF annotation. Adding a sticky note is a single call: page.Annotations.AddTextAnnotation( new Rectangle(72, 720, 200, 740), contents: "Review needed", title: "Editor", open: true); Link annotations combine a clickable rectangle with a PdfAction: ...

The Document class is the heart of Aspose.PDF FOSS for .NET. It represents a complete PDF and provides access to every structure inside — pages, annotations, form fields, metadata, and embedded files. Opening documents Load a PDF from a file, a byte array, or a stream: using var doc = Document.Open(File.ReadAllBytes("input.pdf")); Console.WriteLine($"Pages: {doc.Pages.Count}"); Pages use 1-based indexing: doc.Pages[1] is the first page. Creating from scratch using var doc = new Document(); var page = doc.Pages.Add(); page.Paragraphs.Add(new TextFragment("Hello, PDF!")); doc.Save("hello.pdf"); Tables, floating boxes, headers/footers, and graphs are all paragraph types that the layout engine places automatically. ...

A guide to the shared rendering utilities in Aspose.Page FOSS for Python: RenderModelBuilder, PdfWriter, PdfMetadata, RasterRenderer, and XpsDocumentBuilder.

Aspose.Page FOSS for Python is a free, MIT-licensed library for exporting PostScript (PS), EPS, and XPS documents to PDF and raster images. No Ghostscript or Adobe runtime required.

Aspose.TeX FOSS for Python processes TeX markup and produces PDF, DVI, or SVG output — no LaTeX installation required.

How to use TeXJob with PdfDevice, DviDevice, SvgDevice, FileInputSource, and StringInputSource for TeX typesetting in Python.

A developer guide to using PsDocument for PS and EPS file conversion in Python. Covers to_pdf(), to_image(), DscMetadata, in-memory processing, and batch conversion.

Aspose.PDF FOSS for Java provides a Java-native API for PDF document creation, annotation management, interactive form fields, page manipulation, PDF/A compliance validation, and AES-CBC encryption — MIT licensed, no proprietary dependencies.

PdfFileEditor, ContentsResizeParameters, and PdfPageEditor provide the core PDF document manipulation capabilities in Aspose.PDF FOSS for Java — all MIT-licensed and dependency-free.

The facades layer in Aspose.PDF FOSS for Java provides lightweight, task-focused APIs for annotation management, bookmark editing, document security, stamping, and content extraction — all without requiring direct manipulation of the PDF object model.