LibJpeg.Net is a free and open source .NET and Silverlight version of original libtiff library that allows you to read and create TIFF images in a .NET compatible language.
This easy-to-use software allows you to convert several TIFF files into one PDF file. Available in user-interactive (GUI) Command-line and DLL versions. Support Windows 2000, 2003, 2008, XP and Vista.