Alternatives to Pixelorama

Free and open-source image editor

Open Source Universal 2D Graphics Editor

3D creation suite

2D and 3D game engine

3D model editor for boxy models and pixel art textures

Node-based image, video and audio generator

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

C# scripting capable version of Godot game engine

Simple Gtk# Paint Program

RAW photo processor

8-bit 3D voxel editor and interactive path tracing renderer

Cross-platform video editor