Synthetic World is an Open World Sandbox Game. It allows you to create a unique landscape with mountains, oceans, trees and beaches. Although it looks like a normal game engine, everything in the game is based on voxels. So everything you see can be changed. You can cut down trees, build a house or dig into the ground!
Kingdom Come: Deliverance is a first-person, open-world realistic RPG set in medieval Europe. Unique melee combat, castle sieges, battles and quests in this epic RPG. This game is made by the same people who made Mafia 1,2 and Flashpoint!
UPDATE:The Game will be Buy to Play, not free to play.
Albion Online is a Free-to-Play medieval sandbox MMO. True cross-platform, running on different devices like Apple iPad 2 (and better), Android Tablets, Windows 7, Mac and Linux at the same time and in the same world!
8BitMMO is a retro-style 2D massively multiplayer game! It’s a giant construction sandbox — you can build a home or a castle in a persistent streaming world. Found and manage your own city. Fight evil Lawyercats and engage in player vs player battle. Work in Progress!
Project Starborn is a building game like Minecraft with a very powerful engine behind it and advanced world editing tools. The entire world (and the game itself) is a giant sandbox that you can modify to your liking. If you want to create your own city, it’s as easy as placing a few buildings with a few clicks. You can also design your own buildings or games, giving you ultimate creative freedom!
A year after it’s release, Reprisal has now gone free to play! If you’ve not got your hands on a copy of Reprisal’s desktop edition now you can.
Created in homage to Populous and the nostalgia of 16 bit games, Reprisal lets you take control of a tribe, guiding them, building land and making them grow in number. Using special totem powers you can control nature itself unleashing its full fury on anyone that stands in your way. But be warned, other tribes may not take too kindly to your intentions and will put up a fight!
Salem is a fully open sandbox MMO with deep crafting elements.
Salem is set in a fantastical New England and offers free form massively multiplayer gameplay in a persistent, mutable and online world. With players taking the roles of intrepid colonists from the Old World seeking to make lives for themselves in the New, Salem provides them with unique crafting, farming and building systems inspired by 17th century alchemy. For Windows, OS X, Linux.
Sword & Sworcery meets Minecraft meets Another World.
Under the Garden is a sandbox-style exploration game set in a harsh winter environment, where supplies are limited and resources such as food and lumber for your fireplace have to be gathered from the land. Here you’ll learn how to hunt, mine for valuable items, cut down trees for wood (and to make fireplaces where you can save your game), and construct buildings or bridges out of bricks and boxes.
