pdftohtml is a utility which converts PDF files into HTML and XML formats. It bases on XPDF. And it is open source and written in C++ .

Usage: pdftohtml [options] [ ]
-f : first page to convert
-l : last page to convert
-q : don’t print any messages or errors
-h : print usage information
-help : print usage information
-p : exchange .pdf links by .html
-c : generate complex document
-i : ignore images
-noframes : generate no frames
-stdout : use standard output
-zoom : zoom the pdf document (default 1.5)
-xml : output for XML post-processing
-hidden : output hidden text
-nomerge : do not merge paragraphs
-enc : output text encoding name
-dev : output device name for Ghostscript (png16m, jpeg etc)
-v : print copyright and version info
-opw : owner password (for encrypted files)
-upw : user password (for encrypted files)

I have even use it to generate Excel from PDF, converting a 927 PDF file to Excel document.
btw, it supports windows, linux, mac OSX and so on.

I collect some useful program here, hope it is useful for you.

• IKVM.NET version PDFBOX and the use case is on codeproject
• PDFtoText(pdf2text), it is one of XPDF program serials,btw, Xpdf is an open source viewer for Portable Document Format (PDF) files.
• Ghostscript
• iTextSharp, it can also do some easy job, have a look
  PDFToText with ITextSharp–Extract text from PDF in C# (100% .NET)
• Adobe Acrobat (SDK), it is too expensive, and you have to know some C/C++ language.

only Acrobat is commercial, others are all open source.
if you know other program that can extract text from PDF under dotnet, please let me known, thanks in advance.

A free software that can help you easily Convert PDF to PPT
this need full version Adobe Acrobat and Powerpoint.
I have update the download link, now, you can download it from download page.
if you have special request, please let me know.
if you want Adobe Acrobat Free version please let me know(no need Adobe Acrobat).
if you want source code, please let me know.