PDF Clown is described as 'open-source general-purpose library for manipulating PDF documents through multiple abstraction layers, rigorously adhering to PDF 1.7 Specification'. There are five alternatives to PDF Clown for Windows and Linux. The best alternative is iTextPDF, which is free. Other great apps like PDF Clown are PDFSharp (Free, Open Source), ABCpdf .NET (Paid), Document .Net (Paid) and PDFjet (Freemium, Open Source).
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.
PDFsharp is the Open Source .NET library that easily creates and processes PDF documents on the fly from any .NET language. The same drawing routines can be used to create PDF documents, draw on the screen, or send output to any printer.
«Document .Net» gives you API to do everything with a document in PDF, DOCX, DOC, RTF, HTML and Text formats. Allows to Create, Load, Edit, Merge, Sign digitally, Convert and a lot of actions with a document. Single DOM (Document Object Model) for all formats.