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Docotic.Pdf is a high-performance C# PDF library for .NET. You can use it to create, read, and edit PDF documents in .NET Core, ASP.NET, Windows Forms, WPF, Xamarin, Blazor, Unity, and HoloLense applications.
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Xpdf is a free PDF viewer and toolkit, including a text extractor, image converter, HTML converter, and more. Most of the tools are available as open source.