Free tabletop game: MultipliCITY (Molleindustria)
“MultipliCITY is a basic framework for a city planning board game for any reasonable number of players. Players are split in groups with different interests and build a city together negotiating their often-conflicting agendas. MultipliCITY is meant to be discussed, extended and modified (modded) in a workshop context, therefore the game balance was not a primary concern while designing it”.
MultipliCITY can be downloaded for free at http://www.molleindustria.org/blog/multiplicity/