LDAP for Haskell provides an interface to the C LDAP API for Haskell programmers. With it, you can search and modify LDAP directories. The Haskell binding features automatic memory management and proper handling for binary data, and handles all marshalling into and out of C data structures for you automatically.
DisTract is a distributed bug tracker. DisTract allows you to manage bugs in a distributed and potentially offline manner through your Web browser on your local machine. The distribution is achieved by making use of a distributed software control system, Monotone. Thus Monotone is used to move files across the network, perform merging operations, and track the development of every bug.
Himerge is a GUI for emerge (Gentoo's Portage system) written in Haskell using gtk2hs. The main idea is to simplify browsing the entire portage tree, and allow running the most basic and common options from the emerge command. It also offers several handy tools, like global and local use flags browsers, inspired by UFED (the Gentoo Linux USE flags editor). It also uses eix (a small utility for searching ebuilds with indexing for fast results) as a back-end command to show package information in HTML/CSS format, so you can access a package's Web site for a quick glance.
HDBC provides an abstraction layer between Haskell programs and SQL relational databases. This lets you write database code once, in Haskell, and have it work with any number of backend SQL databases (MySQL, Oracle, PostgreSQL, ODBC-compliant databases, etc.) HDBC is modeled loosely on Perl's DBI interface, though it has also been influenced by Python's DB-API v2, JDBC in Java, and HSQL in Haskell.
The ListLike module provides a common interface to the various Haskell types that are "list-like". Predefined interfaces include standard Haskell lists, Arrays, ByteStrings, and lazy ByteStrings. Custom types can easily be made ListLike instances as well. ListLike also provides for String-like types, such as String and ByteString, for types that support I/O, and for types that can handle infinite lists.
xmonad is a tiling window manager for X. Windows are arranged automatically to tile the screen without gaps or overlap, maximising screen use. Window manager features are accessible from the keyboard; a mouse is optional. xmonad is extensible in Haskell, allowing for powerful customisation. Custom layout algorithms, key bindings, and other extensions may be written by the user in config files. Layouts are applied dynamically, and different layouts may be used on each workspace. Xinerama is fully supported, allowing windows to be tiled on several physical screens.