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...What makes this application more useful than paint programs (powerpoint or inkscape) is the fact that the size of the images and of the molecule is fixed, so that you know that you are working in real space.
Check https://sourceforge.net/p/spm-and-mol-viewer/wiki/Home/ for updates.
PDFsharp is a .NET library for creating and modifying PDF documents.
PDFsharp moved to https://github.com/empira/PDFsharp
PDFsharp is a .NET library for creating and modifying Adobe PDF documents programmatically from any .NET language like C# or VB.NET. PDFsharp defines classes for the objects found in PDF files, so you never have to deal with IDs or references directly.
The downloads include MigraDoc Foundation, a .NET library for creating documents on the fly (supports PDF and RTF).