Based on our record, Solar 2D (formerly Corona SDK) seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I have not made anything in defold. While we're at it, I've also seen https://coronalabs.com/ (the open source version of Solar2d, awful timing on the new brand) but, again, I've no experience with it. By all accounts they're perfectly serviceable frameworks! It's just I only listed things I have direct experience with. Source: over 2 years ago
A call out to Solar2D, previously Corona2D https://coronalabs.com/. - Source: Hacker News / over 2 years ago
Godot Engine - Feature-packed 2D and 3D open source game engine.
Unity - The multiplatform game creation tools for everyone.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
GDevelop - GDevelop is an open-source game making software designed to be used by everyone.
AndEngine - AndEngine is a free android 2D OpenGL game engine.
ct.js - ct.js is a 2D game editor (desktop app) based on web technologies.