So over the past month I've come across three really good sandboxish indie games, and I need more.
So far I've played
Terraria: Great! But I have great equipment and I've done everything, so I'm waiting for more NPCs and stuff. Something to give it endless replayability.
Space Pirates and Zombies Beta: I love it so far, but it gets grindy because you can only upgrade your mothership by beating story missions and you have to grind levels to get tough enough.
Project Zomboid: Very good open world zombie game, but it's still in such an early state that it's hard to spend loads of time on it.
What are some others? Anything that lets you build forts and vehicles and defend from ai attackers? I'm open to any suggestions, really. I love these sorts of games. It's always surprised me that big devs with more cash don't make sandbox games.
Oh, and I know about minecraft too.