Unknown Horizons is a 2D realtime strategy simulation with an emphasis on economy and city building. Expand your small settlement to a strong and wealthy colony and supply your inhabitants with valuable goods.
Fans of the well known ANNO series of strategy games should feel right at home.
Unknown Horizons is freely available and licensed under open-source licences. The code is available under the GPL v2 and content is mostly licenced as CC-BY-SA.