Open-source alternatives to paint.net

3D creation suite

Texassemble is a command-line tool from Microsoft's DirectXTex library, designed for assembling and processing texture arrays, cubemaps, volume maps, and other complex texture types.

This DirectXTex sample is an implementation of the texconv command-line texture utility from the legacy DirectX SDK utilizing DirectXTex rather than D3DX.

Texdiag is a diagnostic command-line tool from Microsoft's DirectXTex library, designed for analyzing and debugging texture files (e.g., DDS, PNG, TGA).

Bot Framework Composer is an open-source, visual authoring canvas for developers and multi-disciplinary teams to design and build conversational experiences with Language Understanding and QnA Maker, and a sophisticated composition of bot replies.

UML Modeller

FREE, open source and cross-platform Data Visualization and Analysis software accessible to everyone and trusted by professionals

We provide in the libwebp codec distribution a reference implementation for the encoder and decoder applications

Free professional image editing

Professional vector graphics (SVG)

View and annotate documents

Photoshop alternative

Online diagram software

3D parametric modeller

A lightweight, versatile image viewer

Tool to optimise images to a smaller size

Electronics design automation suite

Local-first, agent-native design tool

Open-source design editor compatible with Figma

G-code generator for 3D printers

G-code generator for 3D printers (RepRap, Makerbot, Ultimaker etc.)

A free, open-source software suite for editing and manipulating digital images

A convenient installer and a robust portable package of Phil Harvey's ExifTool for Windows

The open source mesh processing system

Image Resizer for Windows

A free drawing app for Windows

Desktop GUI for apic — design and collaborate on Git-friendly API contracts.

The Open Source modelling toolkit for creating ArchiMate models and sketches.

ART is a fork of RawTherapee, a powerful cross-platform raw photo processing program.

Blender Launcher is a standalone software client that provides management for stable, daily and experimental builds of Blender 3D. It is a free open source project available for 64-bit Windows and Linux (GLIBC 2.31 and higher) operating systems.