The John Jay School of Law has done some good work in line of practical assistance of the re-entry process for ex-offenders coming out of prison and jail. They work on two levels. The first being the practical level that a person coming out of incarceration needs to get a life after incarceration. The second level is that of organizations and individuals trying to support those coming out of prison.
They have a lot of information that is readily available on the internet at:John Jay School of Law