Please read the package descriptions in './/.cabal'. If you've acquired this source package from github you should have the examples/ subdirectory. Look at examples/README.md to get started running examples.
Here are some commands you may be interested in. First, install to everything (except for GPU/CUDA-dependent packages):
git submodule update --init --recursive make mega-install
That will install certain dependencies as well (Deques and accelerate), "make install" just installs the packages directly contained within this repo. See the Makefile for other things you can do (e.g. "make mega-install-cuda" which depends on CUDA).
Some of the individual packages have test-suites:
cd monad-par; cabal test
Or for more detailed output: