C# PDF SDK and Tools for Manipulating PDF including PDF Text Extraction. Aquaforest PDF Toolkit consists of a .NET SDK and set of command line tools for manipulating PDF files.

Features Include:
Extract text
Convert and Validate PDF/A
Merge PDFs
Split PDFs
Read and Set Security
Stamps - text, image, watermarks and Bates stamps
Read and Set Dictionary Metadata
Read and Set XMP Metadata
Read and Set Viewer Preferences
Read and Set Bookmarks
Read and Set Attachments
Convert text to PDF
Convert image to PDF
Add Annotations

Create, edit, convert or print Word documents (20+ file formats) from any Java based application. Aspose.Words for Java is an advanced Java Word processing API that enables you to perform a great range of document processing tasks directly within your Java applications. Aspose.Words for Java API supports processing word (DOC, DOCX, OOXML, RTF) HTML, OpenDocument, PDF, EPUB, XPS, SWF and all image formats. With Aspose.Words you can generate, modify, and convert documents without using Microsoft Word.

Use scalable bulk operations (Bulk Insert, Update, Delete, and Merge) and always get the best performance available for your database provider.

SQL Server 2008+
SQL Azure
SQL Compact
MySQL
SQLite
PostgreSQL
Oracle (Coming soon)

TX Text Control .NET for Windows Forms is a free programmable control edited developers the whole range of word processing features in a component for Vyzval Studio offers. This component for comprehensive text formatting features, powerful mail merge feature, the processing of all keywords and key concepts such as support for tables , images , headers and footers and page sections provides.

Create, edit, convert or print Word documents (20+ file formats) from any .NET framework based application. Aspose.Words for .NET is an advanced Word document processing API that enables you to perform a wide range of document processing tasks directly within your .NET applications. Aspose.Words for .NET supports DOC, OOXML, RTF, HTML, OpenDocument, PDF, XPS, EPUB and other formats. With Aspose.Words you can view, generate, modify, convert, render and print documents without using Microsoft Word.

«Document .Net» will help you in development of applications which operates with DOCX, RTF, PDF and Text documents. After adding of the reference to "SautinSoft.Document.dll" (it's 100% C# managed assembly) you will be able to create a new document, parse an existing, modify anything what you want. Not too shabby! Let us say:

Generate new document on fly and fill it by necessary data.
Load existing document and get all it's structure as tree of objects.
Modify paragraph formatting, text, tables, TOC and other elements in existing document.
Parse the document and get the tree of its objects.
Replace, merge any data in documents and save as new DOCX, Text or RTF.
Convert between PDF, DOCX, RTF and Text.

Gnostice PDFtoolkit is a comprehensive and versatile PDF component suite for Delphi™ and C++Builder®. PDFtoolkit VCL components come with hundreds of functions and properties that put immense power in the hands of the developer. PDFtoolkit hides the complexity of the PDF format and allows developers to easily create applications that can edit, enhance, secure, merge, split, view, digitally sign, and print PDF documents and process PDF forms. PDFtoolkit can extract text, export to images, and also add digital signatures. PDFtoolkit does not require PDF software such as Adobe PDF library, Adobe Acrobat Professional, Adobe PDF Reader or GhostScript.

Gnostice PDFtoolkit is a comprehensive and versatile PDF component suite for Delphi™ and C++Builder®. PDFtoolkit VCL components come with hundreds of functions and properties that put immense power in the hands of the developer. PDFtoolkit hides the complexity of the PDF format and allows developers to easily create applications that can edit, enhance, secure, merge, split, view, digitally sign, and print PDF documents and process PDF forms. PDFtoolkit can extract text, export to images, and also add digital signatures. PDFtoolkit does not require PDF software such as Adobe PDF library, Adobe Acrobat Professional, Adobe PDF Reader or GhostScript.