Screeps

Release: 2016
Screeps means “scripting creeps.” It’s an open-source sandbox MMO RTS game for programmers, wherein the core mechanic is programming your units’ AI. You control your colony by writing JavaScript which operate 24/7 in the single persistent real-time world filled by other players on par with you.

Scripting as Gameplay

Real programming, not just pseudocode. You can use libs from real projects.
Use JavaScript or any transpiled language (e.g. TypeScript).
Docs and game API of a full-fledged platform.

Programmable Persistent World

Huge persistent world consisting of 40,000 connected game rooms.
30-server cluster (120 CPU cores) processing player scripts using Node.js.
Programmable world living a continuous life 24/7 in real-time even when you're offline.

Open Source Sandbox

Engine released on GitHub as an open and moddable program platform.
You can change any aspect of game objects' behavior.
The sandbox concept doesn't imply any goal or storyline. You just code for fun in a shared game space alongside other players.
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