GHC is a state-of-the-art, open source, compiler and interactive environment for the functional language Haskell. Highlights:

• GHC supports the entire Haskell 98 language plus a wide variety of extensions.
• GHC has particularly good support for concurrency and parallelism, including support for Software Transactional Memory (STM).
• GHC generates fast code, particularly for concurrent programs. Take a look at GHC's performance on The Computer Language Benchmarks Game, and some comments on Haskell by the current organiser of the shootout, Brent Fulgham.
• GHC works on several platforms including Windows and most varieties of Unix, and several different processor architectures. There are detailed instructions for porting GHC to a new platform.
• GHC has extensive optimisation capabilities, including inter-module optimisation.
• GHC compiles Haskell code either by using an intermediate C compiler (GCC), or by generating native code on some platforms. The interactive environment compiles Haskell to bytecode, and supports execution of mixed bytecode/compiled programs.
• Profiling is supported, both by time/allocation and various kinds of heap profiling.
• GHC comes with a wide range of libraries.

GHC is heavily dependent on its users and contributors. Please come and join the mailing lists and send us your comments, suggestions, bug reports and contributions!