AwesomeBump is a free and open source program written using Qt library designed to generate normal, height, specular or ambient occlusion, metallic, roughness textures from a single image.
CharMorph is an innovative character creation tool based on MB-Lab, offering a seamless and flexible workflow for character artists and animators.
GIMP is a free and open source program designed for photo retouching, image composition and image authoring.
Hugin - Panorama Photo Stitcher
Inkscape is a free and open source vector graphics editor.
JMC2OBJ - Minecraft to .obj converter for makers of MC scenes.
Krita is a free digital painting and illustration application.
LICEcap is a free and open source program that can capture an area of your desktop and save it directly to .GIF, or its own native lossless .LCF file format. It is available for Windows and Mac only, but the Windows version works remarkably well on Linux, through Wine.
MB-Lab is a free and open source Blender add-on up to Blender 4.0 that creates humanoid characters. For Blender 4.1 and newer, take a look at CharMorph. It is based off the popular ManuelBastioniLAB and offers standard skeletons for animation, anthropological phenotypes library, clothing and hair, morphing parameters, Anime Characters, and facial expressions as shape keys.
MakeHuman is a free and open source software for creating realistic 3D human models and rigs. The add-on MPFB2 can be thought of as a reimplementation of MakeHuman as a Blender add-on.
Materialize Free and Open source tool for creating material layers from flat images. Diffuse -> Height, Diffuse -> Metallic, Diffuse -> Smoothness, Height -> Normal, Height + Diffuse -> Normal, Normal -> Edge, Normal -> Occlusion, Normal + Height -> Occlusion, Normal -> Height, Seamlessly tile your textures, Save and load in a variety of formats, Automate many processes with clipboard commands in xml format.
Meshroom is a free, open-source
3D Reconstruction Software based on the AliceVision framework.
Peek is also a free and open source program that can capture and area of your desktop and save it directly to .GIF, which it is optimized for, or to .APNG, .WebM, or .MP4. It is made for Linux operating systems.
PureRef is a simple and lightweight freeware tool for artists to organize and view their reference images. It is available for Windows, Mac or Linux.
Daz 3D The standalone free software can export human models to Blender file format. It also has a paid store of assets for figures like clothing.