Games like Islet Online on Steam
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Project: Gorgon
Project: Gorgon is a fantasy MMORPG that allows you to forge your own path through exploration and discovery.
Last Oasis
Nomadic Survival MMO. Build wooden walking machines to travel to new lands. Create clans and fight for territory. Resources deplete fast, so take your sword and scavenge, pirate, and trade to stay alive.
Angeldust
ADVENTURE. ANYWHERE! Explore endless magical worlds and battle fearsome creatures alongside millions of friends. Ride your own horse, bear or moa and discover the many game world wonders. Unleash your imagination by crafting beautiful buildings.
Villagers and Heroes
Enter a magical, 3D fantasy world filled with hundreds of unique locales, immersive lore, and exciting quests -- and it's all free to play. Join thousands of players from around the world, and be part of a one of a kind community.
Perpetuum
Perpetuum is a persistent, sandbox, single server, massively multiplayer sci-fi rpg (MMORPG). Control huge robots and mechs to gain access to an alien planet's resources and knowledge, amass huge wealth, or even claim part of the world for yourself using terraforming and complex infrastructure.
Wurm Online
A sandbox MMORPG that has pushed the boundaries on what it means to be open world and stood the test of time. Dig, mine, shape the world around you and make your lasting mark!
Stash
Stash is an MMO with turn based grid combat, custom housing, a tabletop art style, and more loot than you can fit in a portable hole. Stash has the charm of a pen-and-paper gaming group with the gameplay of a deep, interesting, unique RPG. Join our friendly community!
Reign of Guilds
Reign of Guilds — the spiritual successor to the old-school fantasy where steel, magic, and skill decide your fate. Inspired by the legacy of Ultima Online and EverQuest.
Champions of Regnum
Choose your Realm and engage in the most dynamic player driven battlefield available on any MMO. Fight for the Alsius Empire, protect the woods of Syrtis or avenge the Brotherhood of Ignis.
Wurm Unlimited
Wurm Unlimited is the standalone version of the fantasy sandbox world Wurm Online, the MMORPG where the players are in charge! A pioneer in the ideas of player influence, crafting and adventure, it is now one of the most deep and feature packed true sandbox experiences available.
Tinkertown
Gather your friends and come to Tinkertown - A refreshing new Multiplayer Sandbox Experience! Explore magical places filled with loot, danger, and creativity.
Windforge
WindForge is a side-scrolling block-building game where you explore hostile skies in an ever-changing Steampunk world. Everything you see can be created or destroyed, creating an RPG without barriers that rewards creative problem solving and improvisation.
Onset
Onset is an open world Lua scripting sandbox without predefined goals. Choose from hundreds of Lua functions from our Developer Wiki to create your own scripts and gamemodes. Onset is a perfect starting point for beginners interested in learning how to program.
Albion Online
Albion Online is a fantasy sandbox MMORPG featuring a player-driven economy, classless combat system, and intense PvP battles. Explore a vast open world full of danger and opportunity. Grow your wealth, forge alliances, and leave your mark on the world of Albion.
Citadel: Forged with Fire
This massive online sandbox RPG features elements of magic, spellcasting, building, exploring and crafting. As a newly minted apprentice of the magic arts, you will set off to the dangerous world of Ignus. Tame mighty beasts, forge alliances, explore uncharted territories or fight for dominance!
Fantasy Tales Online
Fantasy Tales Online is a retro MMORPG where you must form parties, collect gear, fight through dungeons and defeat bosses. Featuring puzzles, a rich item system and complex encounters. This isn’t your run-of-the-mill grindfest MMO title!
Necesse
Build, quest, and conquer across an infinite procedurally generated world. Play alone or with friends as you establish a settlement and explore deep dungeons, fight monsters and bosses, mine rare ores, craft magical equipment, recruit specialists for your colony, and more!
Kenshi
A free-roaming squad based RPG. Focusing on open-ended sandbox gameplay features rather than a linear story. Be a trader, a thief, a rebel, a warlord, an adventurer, a farmer, a slave, or just food for the cannibals. Train your men up from puny victims to master warriors.
Plains of Pain
Survive a brutal open world alone or with friends. Explore a procedural wasteland scorched by chaos. Build and defend your base, trade for what you need, complete deadly quests, and fight to claim faction outposts before someone else does.
Planet Explorers
Planet Explorers is an open world sandbox adventure RPG game set on a distant planet. The game uses a new OpenCL calculated voxel system to allow players to change the terrain in any way, create new objects such as weapons, vehicles, objects, and do it anywhere.
Tree of Savior (English Ver.)
Tree of Savior(abbreviated as TOS thereafter) is an MMORPG in which you embark on a journey to search for the goddesses in the world of chaos. Fairy-tale like colors accompanied with beautiful graphics in TOS will have you reminiscing about precious moments all throughout the game.
Portal Knights
The world of Elysia needs YOU! Join this cooperative, 3D sandbox action RPG to level up your character, craft epic weapons, conquer enemies in real-time, and build almost anything! Craft your adventure. Forge your hero. Become the ultimate Portal Knight!
Day of Dragons
Day of Dragons is an online creature survival game set in a large, beautiful, sandbox open world with multiple biomes and distinct creatures. Rule the world as one of several dragon species, or play as an elemental.
The Matchless Kungfu
The Matchless Kungfu is an open world sandbox RPG game based on a WuXia background. You can play any martial arts role you imagine in this wild world. Travel through the great wilderness, or be the leader of the group. The most important thing is, build your own story and live the experience!
Idle Clans
Idle Clans is a multiplayer idle game that combines the classic MMORPG experience with simplified gameplay and less time commitment. Features include a player-driven economy, PvE, trading, quests, crafting and opportunities to play, socialize and collaborate with other players.
Total Miner
Total Miner is an open world voxel sandbox game. It is primarily designed for creative RPG game builders, but also has two action/adventure style game modes where you can just jump in and play.
Pixel Worlds: MMO Sandbox
Award winning indie game studio Kukouri welcomes you to our multiplatform MMO sandbox: Pixel Worlds! (” Best Indie Game Developer ” Global Mobile Game Awards 2019) Play free with friends, create your own worlds and stories. Fight off the enemies and get awesome items in this award winning indie MMO!