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Parsing

Char	Decodes, encodes and normalizes UNICODE, UTF8, HTML and URI/URL strings
DateParser	Parses and normalizes different date formats (e.g. "January 5th, 2000" or "500 BC")
Name	Provides primitive heuristics to recognize and parse person names and organization names
NounGroup	Splits a noun group (given by a String) into its modifiers and its head
NumberParser	Parses and normalizes complex number expressions (e.g. "10 million meters")
NumberFormatter	A simple number formatter
PlingStemmer	Stems an English noun to singular. Knows nearly all exceptions.
RegularExpression	Parses a Regular Expression and converts it to an automaton, allows to invert it

Database

Database	This abstract class provides a simple Wrapper for an SQL data base, including a bulk inserter.
MySQLDatabase	implements the Database-interface for a MySQL data base.
OracleDatabase	implements the Database-interface for an Oracle SQL data base
PostgresDatabase	implements the Database-interface for a Postgres SQL data base
ResultIterator	An Iterator across an SQL database ResultSet
SQLType	Implements SQL datatypes in a database-specific way
WordNet	provides a (non-database) wrapping for WordNet
DBWordNet	provides a database wrapping for WordNet

Datatypes and Iterators

ArrayQueue	Implements a simple non-blocking queue
BitVector	Implements a bit vector, i.e. a list of bits, a set of small integers
CombinedIterator	Combines multiple iterators to one iterator
CompressedString	Compresses a String in a potentially lossy way to 7, 6 or less bits per character (instead of 16)
DirectedGraph	Implements a directed graph wit ancestor finding
FilteredIterator	Implements an iterator that allows filtering out certain elements
FinalMap	Provides a nicer constructor for a TreeMap
FinalSet	Provides a very simple container implementation with zero overhead
Frequency Vector	Provides recall and precision measures on bags of words, including fuzzy recall and fuzzy precision, and Wilson Interval computation
Immutable	Wraps a list or a set so that it becomes immutable.
IntSet	implements a set of small integers as a bit vector with constant time access
IterableForIterator	Wraps an iterator so that it can be used in a for-each-loop
IterableForEnumeration	Wraps an untyped enumeration into a typed iterator
MappedIterator	implements an iterator that maps each element by a function before yielding it
Pair	For the simple datatype Pair
PeekIterator	An Iterator that can look ahead (peek) one element
SmallStack	Implements a fast stack for int, long, double
SparseVector	Represents a Sparse Vector, i.e. a vector that has only few non-zero entries. Implements k-means
SmallStack	Represents an efficient stack for primitive datatypes (int, long, double, boolean)
SVMModel	Implements an SVM-light-Model
Tree	For the simple datatype Tree
Trie	implements a trie (an efficient set of strings based on prefixes)
UndirectedGraph	implements an undirected graph
Visitor	For the common visitor design pattern
Visitable	For the common visitor design pattern

Administrative

Announce	Provides an easy log writer with timed progress bars
D	Provides convenience methods for Input/Output. Allows to do basic I/O with easy procedure calls -- nearly like in normal programming languages. Furthermore, the class provides basic set operations for EnumSets.
CallStack	Allows to retrieve the method name and the source code line number of the current code position at runtime
Parameters	Provides an interface for an initialization/configuration/properties-File
Tracer	Provides an tracer that can figure out where a program hangs if a method runs for longer than a given time period

FileHandling

CSVFile	Writing to a comma-separated file (CSV file).
CSVLines	Can iterate through the columns of a comma-separated file (CSV file).
DeepFileSet	Represents a set of files as given by a wildcard string. Can recurse subfolders.
FigureProducer	Produces Latex tables and JPG plots for table data
FileLines	Provides an iterator over the lines in a file
FileSet	Represents a set of files as given by a wildcard string. Does not include folders, is not case-sensitive.
HTMLReader	Reads characters from an HTML-file
MatchReader	Provides an iterator over Regular Expression matches in a file
SimpleInputStreamReader	Reads characters from a file, regardless of the encoding
SimpleOutputStreamWriter	Writes character to a file, regardless of the encoding (see here for a problem description)
UTF8Reader	Reads characters from an UTF8-encoded file
UTF8Writer	Writes UTF8-encoded characters to a file