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Alex is a tool for generating lexical analysers in Haskell. It takes a description of tokens based on regular expressions and generates a Haskell module containing code for scanning text efficiently. It is similar to the tool lex or flex for C/C++.

A common problem is the desire to have an action run at a scheduled interval, but only if it is needed. This library allows you to define actions which will either be performed by a dedicated thread or, in times of low volume, will be executed by the calling thread.

A simple directory-like tree datatype, with useful IO functions and Foldable and Traversable instance. Provides a simple data structure mirroring a directory tree on the filesystem, as well as useful functions for reading and writing file and directory structures in the IO monad.

The haskell-src package provides support for manipulating Haskell source code. The package provides a lexer, parser and pretty-printer, and a definition of a Haskell abstract syntax tree (AST). Common uses of this package are to parse or generate Haskell 98 code.

This library provides a quick-and-dirty (but often effective) method for extending Haskell's syntax using a custom preprocessor. It parses Haskell into a bare-bones AST with just enough knowledge of the syntax to preserve nesting, and then allows transformations on the AST.

ANTLR, ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages. ANTLR provides excellent support for tree construction, tree walking, translation, error recovery, and error reporting. This package provides the ANTLR v3 C runtime library.

Check is a unit test framework for C. It features a simple interface for defining unit tests, putting little in the way of the developer. Tests are run in a separate address space, so Check can catch both assertion failures and code errors that cause segmentation faults or other signals.

libevdev is a wrapper library for evdev devices. It moves the common tasks when dealing with evdev devices into a library and provides a library interface to the callers, thus avoiding erroneous ioctls, etc. The eventual goal is that libevdev wraps all ioctls available to evdev devices, thus making direct access unnecessary.

mtdev is a stand-alone library which transforms all variants of kernel MT events to the slotted type B protocol. The events put into mtdev may be from any MT device, specifically type A without contact tracking, type A with contact tracking, or type B with contact tracking. See Linux kernel documentation for further details.

The libmba package is a collection of mostly independent C modules potentially useful to any project. There are hashmap, linkedlist, and stack ADTs, a DOM- like interface that can load and store XML files for simple XML processing, a module for managing error codes and associated messages across separate C libraries, and more.