
Flip Fluids
by RLGUY
FLIP Fluids is a liquid simulation addon for Blender that lets you set up, run, and render high-quality liquid effects. Its custom FLIP-based engine has been in development since 2016 with tight Blender integration.
by Sreeraj R·Simulation
Images © Sreeraj R. Used for product review; image policy.
TwoDPhysics stands out in the Superhive library for targeting a specific gap: 2D rigid body physics in Blender, where the native engine is built for 3D work.
TwoDPhysics is a 2D rigid body simulation add-on built for Blender 2.80. Since Blender 2.8, it has been possible to create a fully fledged 2D animation in Blender using grease pencil or other means. Until now, there hasn't been a dedicated 2D rigid body physics engine for Blender.
Blender's existing physics engine is built for 3D simulations, and setting up a 2D simulation with it takes considerable effort. TwoDPhysics is aimed at that gap, providing a physics engine focused specifically on 2D rigid body simulation.
The add-on is currently available for both Windows and Linux and ships with documentation. It is released under the GPL license. A demo video is available for those who want to see more before adding it to their Blender workflow.
Twodphysics is best for blender animators working on 2D rigid body simulations who need a dedicated physics engine rather than the built-in 3D system.
Twodphysics is completely free to download and use.
TwoDPhysics is built for Blender 2.80, and is listed with support for Blender 2.8 and 2.81. It arrived after Blender 2.8 made fully fledged 2D animation possible using grease pencil or other means. If you are working in one of these Blender versions, the add-on is designed to fit that environment. For details on any newer Blender releases, check the developer's page before installing.
TwoDPhysics is currently available for both Windows and Linux, so users on either platform can add it to their Blender setup. Support for other operating systems is not stated here, so if you work on a different platform, consult the developer's page to confirm availability before you rely on it for a project. The add-on ships with documentation to help you get started once installed.
TwoDPhysics is listed as free in this catalog and is released under the GPL license. Licensing terms can change over time, so for the most current details it is best to check the developer's page directly. The add-on also comes with documentation, which is useful for understanding how it fits into a Blender 2D animation workflow once you have it set up.
TwoDPhysics exists because Blender's existing physics engine is dedicated to 3D simulations, and creating a 2D simulation with it requires a good deal of workaround effort. TwoDPhysics is a dedicated 2D rigid body physics engine, aimed at that gap so 2D work does not depend on adapting a 3D-focused system. It is designed to work with fully fledged 2D animation in Blender using grease pencil or other means.

by RLGUY
FLIP Fluids is a liquid simulation addon for Blender that lets you set up, run, and render high-quality liquid effects. Its custom FLIP-based engine has been in development since 2016 with tight Blender integration.

by VjaceslavT
Simply Cloth Studio 2 is a cloth creation and simulation add-on for Blender, rebuilt for Blender 5.0 with a modern interface, an adaptive wrinkle recognition system, and performance improvements, alongside tools for pinning, sewing, and cloth presets.

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RBDLab is a VFX and simulation addon for Blender, developed by BeFX Studios for rigid body and destruction work. It ships with documentation and free updates, and holds a 5-star rating from 70 reviews.

by Physical Addons
Physical Open Waters - Ocean is a Blender add-on from Physical Addons for infinite ocean simulations, offering advanced LOD stability and dynamic wave interactions. It renders in both Cycles and Eevee.

by naelstrof
Jiggle Physics adds stretchy jiggle physics to Blender rigs. A fork of the Wiggle 2 add-on by shteeve3d, it uses a verlet solver with simple 0-1 parameters to animate anything from soupy ropes to immovable rods.

by k44dev Software
X-Muscle System is a physics-based tissue simulator add-on for Blender, built for creating muscular systems, tissue and organic objects and running physical simulations that visualize skin surface deformations based on volume preservation of muscles, fat and bones.