GameMaker
A 2D engine combining visual editing and GML, targeting desktop, web, mobile, and licensed console exports.
Why use it
An editor and language focused tightly on game production help small teams move from prototype to shippable project.
Where it fits
Find engines, frameworks, code libraries, version control, and production automation.
What to check
The free license is noncommercial; commercial release needs a one-time Professional license and console export needs Enterprise.