Ace of Spades: Battle Builder - Say hello to the creative shooter. Create your battleground, destroy it, then create it again.
Blockland - Blockland is a non-competitive multiplayer sandbox-style construction game. It's kind of like playing with legos on the internet.
Lunacraft - Lunacraft focuses on Endless Creativity and Exploration elements.
NERF Arena Blast - The website linked is not real page, just moddb page.
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.
Blocksworld Wool - Download mods for Blocksworld!