JagPDF : A library for generating PDF documents in C/C++, Python, and Java

JagPDF is a library for generating PDF documents in C/C++, Python, and Java. It supports TrueType (subsetting) and standard 14 Type 1 fonts, font metrics, Unicode, UTF-8 and common 8-bit character encodings, images (JPEG, PNG, or custom), paths, color spaces (RGB, CMYK, CIE based, ICC profiles, indexed), encryption, bookmarks, hyperlinks, and more.

• Licenses : Open Software, MIT/X
• Operating Systems : Windows, Linux
• Implementation : C, C++, Python, Java

Xapian : A search engine library, scalable to collections containing hundreds of millions of documents

Xapian is a search engine library, scalable to collections containing hundreds of millions of documents. It's written in C++ with bindings for Perl, Python, PHP, Java, Tcl, C#, and Ruby. It is a highly adaptable toolkit that allows developers to easily add advanced indexing and search facilities to their own applications. It supports the Probabilistic Information Retrieval model and also a rich set of boolean query operators. Omega is a Web search application built upon the Xapian library. It can index a Web server's document tree (including HTML, PDF, OpenOffice, MS Word/Excel/Powerpoint/Works, WordPerfect, RTF, PS, etc.), or data exported from arbitrary sources (e.g. SQL databases).

• Licenses : GPL
• Operating Systems : Windows, Unix, Mac OS X, OS/2
• Implementation : C++, Perl, PHP, Python, Java, Tcl, Ruby, C#