ANNO - ANNO is a city-building and economic simulation video game series, with real-time strategy elements.
Stronghold - Stronghold Crusader is a RTS game from the series from Stronghold.
Banished - As always, Email support (at) shiningrocksoftware (dot) com if you have any issues. This will likely be the last update of Banished, except for any major bug fixes. The OSX and Linux versions development has stopped, and won't be released.
The Settlers Online - The Settlers is a free web browser based strategy game along with a gameplay that drops anywhere between Age of Empires and the online strategy style.
Towns - The game brings a fresh new take on the city building/management genre by introducing many RPG features. In Towns you manage a settlement on top of an active dungeon.
RimWorld - RimWorld - A sci-fi colony sim driven by an intelligent AI storyteller.