ZingPDF is a .NET 8 library for reading, editing, creating, templating, and saving PDF files in C#. It's free for non-commercial use.
Cost / License
- Free Personal
- Open Source
Platforms
- Mac
- Windows
- Linux
- Docker

PdfPig is described as 'Fully open-source Apache 2.0 licensed and .NET Standard compatible library that enables users to read and create PDFs in C#, F# and other .NET languages. It supports all versions of .NET back to .NET 4.5' and is an app. There are more than 10 alternatives to PdfPig for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Docker apps. The best PdfPig alternative is ZingPDF. It's not free, so if you're looking for a free alternative, you could try ZingPDF or PDFSharp. Other great apps like PdfPig are Docotic.Pdf, PDFjet, Document .Net and Wicked PDF.
ZingPDF is a .NET 8 library for reading, editing, creating, templating, and saving PDF files in C#. It's free for non-commercial use.

The leading Java and C# PDF Library SDK. A programmable Java and .NET PDF SDK library to create, manipulate and edit PDF documents. Convert Html files to pdf, Debug pdf files, extract data from PDF and more.
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.

«Document .Net» gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats.

ASP/ASP.NET components for C# and VB.NET developers. Dynamically edit PDF documents and images server-side, OCR images, and upload files with WebSupergoo.
PDF Clown is an open-source general-purpose library for manipulating PDF documents through multiple abstraction layers, rigorously adhering to PDF 1.7 Specification.
ReLaXed creates PDF documents interactively using HTML or Pug (a shorthand for HTML). It allows complex layouts to be defined with CSS and JavaScript, while writing the content in a friendly, minimal syntax close to Markdown or LaTeX.