IrrXML is a high speed and easy-to-use XML parser without external dependencies. It is very small and provides forward- only, read-only access to a stream of non-validated XML data through an extensible object oriented interface. It ideally fits into realtime projects which need to read XML data without overhead, like games.
libHaru is a library for generating PDF files. It supports generating PDF files with lines, text, images, outlines, text annotations, and link annotations, compressing a document with deflate-decode, embedding PNG and JPEG images, embedding Type1 and TrueType fonts, creating encrypted PDF files, using various character sets, using CJK fonts and encodings, and basic U3D usage.
libunibreak is an implementation of the line breaking and word breaking algorithms as described in Unicode Standard Annex 14 and Unicode Standard Annex 29. It is a superset of, and supersedes, liblinebreak. It is designed to be used in a generic text renderer. FBReader is one real-world example.