Alternatives to Pixelorama

Free and open-source image editor

3D creation suite

Open Source Universal 2D Graphics Editor

2D and 3D game engine

3D model editor for boxy models and pixel art textures

Procedural material authoring and 3D painting tool based on the Godot Engine

C# scripting capable version of Godot game engine

Image editor

Node-based image, video and audio generator

Photoshop alternative

Simple Gtk# Paint Program

RAW photo processor