XGASOFT
International Game Arts - "Telling stories with code."
www.xgasoft.com (homepage) | www.xga.one (developer portal)
The simplest, setupless, pixel-perfect, most helpful, most versatile display scaler for GameMaker Studio 2.3
Essential Extensions for the Way You Work
Robust Native Archives for GameMaker Studio 2
Instant Real-time Placeholders
Easily create dynamic visual novel content and sequenced animations with VNgen by XGASOFT
A collection of 6 developer tools for GameMaker Studio 1.4. Legacy, but still handy!