1. Galacticraft: Galacticraft is a server that focuses on space exploration and colonization. Players can build their own rockets and travel to different planets, create colonies, and participate in space-themed activities.

2. Pixelmon: Pixelmon is a server that combines Minecraft with the popular Pokemon franchise. Players can catch, train, and battle Pokemon in a Minecraft world, adding a unique twist to the traditional Minecraft gameplay experience.

3. Starbound: Starbound is a server that takes players on a journey through the galaxy, where they can explore and colonize different planets, fight off alien enemies, and uncover the mysteries of the universe. It offers a similar space exploration theme to Horizons End .

4. Space Engineers: Space Engineers is a server that focuses on building and designing spacecraft, space stations, and other space-related structures. Players can work together to create intricate space systems and engage in cooperative gameplay.

5. Astral Imperium: Astral Imperium is a server that offers a mix of survival, exploration, and space-themed gameplay. Players can explore a vast universe, build their own bases, and participate in faction-based warfare for control of territories.

These servers offer a similar experience to Horizons End , with their own unique twists and features that make them worth checking out for players looking for immersive and exciting gameplay experiences in Minecraft.