ECoS is described as 'modern fantasy console based around the solid foundation of an Entity-Component-System architecture (ECS)' and is a Game Development Tool in the Development category. There are more than 10 alternatives to ECoS for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Self-Hosted solutions. The best alternative is TIC-80, which is both free and Open Source. Other great apps like ECoS are PICO-8 (Paid), Voxatron (Paid), Bitsy (Free) and quadplay (Free, Open Source).
Voxatron is a fantasy console system where games are made out of voxels and made available to the system as traditional cartridges that can be made from scratch through a built-in designer or remixed from other shared creations.
The quadplay fantasy console bundles an emulator and advanced development tools including an adept IDE and tools for use with other IDEs like VS Code, Vim and Emacs. FEATURES - 60 fps @ 384 x 224 pixels = 12:7 aspect ˜ 16:9.
Pixel Vision 8 is a platform that standardizes 8-bit fantasy console limitations built on top of an open source C# SDK. Developers can customize these restrictions to match actual legacy hardware or create something new. It is ideal for game jams, prototyping ideas or having fun.