"The other extreme is products and services that are cost-free. The open-source FreeEED project may get traction now that it's available for Microsoft Windows. In addition, FreeEDD will soon tackle automated document review, project leader Mark Kerzner said. Open source is sometimes controversial for developers' philosophical approach, and for what closed-sourced vendors allege are hidden costs of implementation and support. But at least you know what the base software costs -- nothing."