Question: The plugin that offers a professional, for a free and open-source 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, interactive 3D applications and video games,   3D modeling of what?

Context paragraphs:
LightWave 3D: LightWave 3D is a 3D computer graphics software developed by NewTek.  It has been used in film, television, motion graphics, digital matte painting, visual effects, video games development, product design, architectural visualizations, virtual production, music videos, pre-visualizations and advertising.

Fork Particle: Fork Particle is a computer graphics visual effects modeling and software development kit (SDK) developed and sold by Fork Particle, Inc.  Fork Particle uses its real time particle system technology to simulate visual effects or particle effects such as CGI explosions, fire, rain, smoke, dust, etc.  Fork Particle is used in video games and visual simulation software such as a flight simulator.  It has been licensed to game developers for Windows, macOS, Linux, PlayStation 3, PlayStation 4, Xbox 360 and Xbox One.

Blender (software): Blender is a professional, free and open-source 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, interactive 3D applications and video games. Blender's features include 3D modeling, UV unwrapping, texturing, raster graphics editing, rigging and skinning, fluid and smoke simulation, particle simulation, soft body simulation, sculpting, animating, match moving, camera tracking, rendering, motion graphics, video editing and compositing.  It also features an integrated game engine.

List of 3D rendering software: This page provides a list of 3D rendering software.  This is not the same as 3D modeling software, which involves the creation of 3D models, for which the software listed below can produce realistic rendered visualisations.  Also not included are general-purpose packages which can have their own built-in rendering capabilities; these can be found in the List of 3D computer graphics software and List of 3D animation software.  See 3D computer graphics software for more discussion about the distinctions.

Autodesk Maya: Autodesk Maya , commonly shortened to Maya, is a 3D computer graphics software that runs on Windows, macOS and Linux, originally developed by Alias Systems Corporation (formerly Alias|Wavefront) and currently owned and developed by Autodesk, Inc. It is used to create interactive 3D applications, including video games, animated film, TV series, or visual effects.

Real-time computer graphics: Real-time computer graphics or real-time rendering is the sub-field of computer graphics focused on producing and analyzing images in real time.  The term is most often used in reference to interactive 3D computer graphics, typically using a Graphics processing unit (GPU), with video games the most notable users.  The term can also refer to anything from Rendering an application's GUI to real-time image processing and image analysis.

Computer-generated imagery: Computer-generated imagery (CGI) is the application of computer graphics to create or contribute to images in art, printed media, video games, films, television programs, shorts, commercials, videos, and simulators.  The visual scenes may be dynamic or static and may be two-dimensional (2D), though the term "CGI" is most commonly used to refer to 3D computer graphics used for creating scenes or special effects in films and television.  Additionally, the use of 2D CGI is often mistakenly referred to as "traditional animation", most often in the case when dedicated animation software such as Adobe Flash or Toon Boom is not used or the CGI is hand drawn using a tablet and mouse.

ManuelbastioniLAB: ManuelbastioniLAB is a free and open source plug-in for Blender for the parametric 3D modeling of photorealistic humanoid characters.

Remo 3D: Remo 3D is a 3D computer graphics software specialized in creating 3D models for realtime visualization.  As opposed to many other 3D modeling products that are primarily intended for rendering.  Remo 3D focuses on supporting realtime features like full control of the model scene graph, and modification of features like degrees-of-freedom nodes (DOF), levels-of-detail (LOD), switches, etc.  Remo 3D's primary file format is OpenFlight and it allows for importing from and exporting to different file formats.  This makes Remo 3D suitable for creating realtime 3D models intended for use in virtual reality software, simulators and computer games.

List of 3D computer graphics software: This list of 3D graphics software contains software packages related to the development and exploitation of 3D computer graphics.  For a comparison see Comparison of 3D computer graphics software.

Supporting paragraphs: ManuelbastioniLAB Blender (software)
Answer: humanoid characters