A well-gray open source project [C + +]

ClibPDF
http://cosoft.net.cn
Http://www2s.biglobe.ne.jp/~Nori/ruby/dist/ClibPDF-ALPHA-20010519.tar.gz
Http://www2s.biglobe.ne.jp/~Nori/ruby/dist/ClibPDF-ALPHA-20010519.tar.gz

Libharu PDF Parsing Open source
Http://libharu.org/wiki/Downloads

PDFCreator VB. PDF printer
http://sourceforge.net/projects/pdfcreator/files/

Mupdf PDF Parsing Open source
http://www.mupdf.com/download/

Xpdf
Http://www.foolabs.com/xpdf/download.html

Podofo can be used to read and write and analyze the structure and internal composition of PDF files
http://podofo.sourceforge.net/

OpenOffice Office Open Source
Http://download.openoffice.org/source/index.html

AbiWord
http://www.abiword.org/projects/
http://www.abisource.com/downloads/abiword/2.0.0/

Libpng a library of parsing PNG image formats used by multiple applications
ftp://ftp.simplesystems.org/pub/libpng/png/src/

C + + Sockets Library
Http://www.alhem.net/Sockets/download.html

SDL is a free cross-platform multimedia development Package
http://www.libsdl.org/

WebKit Browser Core Open source
http://webkit.org
Http://nightly.webkit.org/builds/trunk/win/1

Larbin Open-Source search engine
Http://larbin.sourceforge.net/index-eng.html

Libzplay Open-source MP3 engine
http://libzplay.sourceforge.net/

Zlib Professional Compression Library
http://www.zlib.net/

Curl uses URL syntax to work with file transfer tools in command line mode
http://curl.haxx.se/

TrueCrypt Hard Disk Encryption
http://www.turecrypt.org

Free Open Source Resources abroad (good)

Http://www.thefreecountry.com/sourcecode/sockets.shtml

Transferred from: http://www.cnblogs.com/tanweizlf/archive/2012/06/20/2556233.html

A well-gray open source project [C + +]