The Castle Doctrine Alternatives
The Castle Doctrine is described as 'The Castle Doctrine is a massively-multiplayer game of burglary and home defense. It's 1991, and things are bad. You're a guy with a house and family. Other players are coming to take what's yours. Build security to stop them' and is an app. There are four alternatives to The Castle Doctrine for Windows, Linux and Steam. The best alternative is Dungeon Keeper 2. It's not free, so if you're looking for a free alternative, you could try OpenDungeons. Other great apps like The Castle Doctrine are Evil Genius and The Mighty Quest for Epic Loot.
Discover your evil side as you build your own underground kingdom. Carve out a living, breathing world and attract a host of devilish creatures to swell the ranks of your dark hoards.
Discontinued
Discontinued but available at GoG: https://www.gog.com/game/dungeon_keeper_2
Build a secret base, gain notoriety by completing daring missions, repel the forces of justice in real-time combat, and develop evil super-weapons to complete your nefarious master plan.
Discontinued
The game was released on September 28, 2004. It can be still bought from GOG.com
As a newcomer to Opulencia, you will hack n slash your way through hundreds of castles designed by the ingenious minds of your fellow players! Don’t forget to show them who’s boss by constructing deadly keep of your very own – in this kingdom, size really does matter!
Discontinued
This game was shut down, it is no longer playable at all.
OpenDungeons is an open source, real time strategy game sharing game elements with the Dungeon Keeper series and Evil Genius. Players build an underground (or overground) dungeon which is inhabited by creatures.