Luanti
Could be interesting
Terasology is a super extensible open source voxel-based game. Born from a Minecraft-inspired tech demo, it is gradually becoming a platform for all sorts of gameplay settings in a voxel world. Terasology is fully open source and is licensed under the Apache 2.0 license for code and under CC BY 4.0 for artwork.
Gangstar: Crime City is an open-world action-adventure video game published by Gameloft and developed by at least one of its subsidiaries; it is the first installment in the Gangstar series, was released in October 2006 for button-operated mobile phones, and is set in Crime City.
A Chinese role-playing game for Android, with a story and world adapted to a large extent from the world of the Pokémon series games, where the main character goes on an adventure in a world full of monsters, he must collect and strengthen monsters, compete with the nine gym leaders, and enter the Monster League, and during that meet and descend Legendary monsters.
The legends speak of a long forgotten prophecy... of a shining hero and of perilous adventures... of sinister powers, strange worlds and swarms of fairies ... but they said nothing of a girl with a big heart instead of a big sword!
Open World Guerrilla Warfare - You decide who, when, where and how to battle. Utilize guerrilla tactics, improvised weaponry, and modified vehicles to lead insurgent attacks on EDF targets. Launch attacks based on your own gameplay style, take on missions in any order you choose, or engage in destructive activities to weaken the EDF's grip on Mars. Strategic Destruction - Use destruction to your tactical advantage, setting ambushes or chain reaction explosions to attack enemy strongholds and permanently modify the game environment. Leverage fully-dynamic physics-based destruction to improvise on the fly: blow holes in a wall or floor to set an ambush or escape, take out a staircase to stop your pursuers, or drive vehicles through blown out walls. Evolving & Emergent Gameplay - Carve your path through an ever changing landscape as you improvise your combat tactics - mixing gameplay styles, vehicles, weapons and explosives to defeat the EDF. Epic Sci-Fi Setting - Explore the huge, unforgiving Martian landscape, from the desolate mining outpost of Parker to the gleaming EDF capital city of Eos; then tear through the fully destructible open-world environments swarming with EDF forces, Red Faction resistance fighters, and the downtrodden settlers caught in the cross-fire.
An unreleased open world Crash Bandicoot game which would have introduced Crush Bandicoot as an evil twin to the titular character, and it was intended to feature zany, open-world sci-fi environments.
A Metroidvania experienced entirely just in the map!
i'm feeling like i wanna grab the pearls
Look, walk, and talk like a duck!
A short Gameboy inspired game about exploration and puzzle solving.