https://blendermarket.com/products/audvis

AudVis is a Blender 2.8x add-on helping you to build awesome audio visualizations. The main features are Real Time Analyzer and Sequence Analyzer.

CAD like transform operations for blender 2.81+ / 2.91+ / 3.0 - 3.9

• Precise Move / Rotate / Scale

• Works in both object and edit mode for mesh and curves

• Support “Affect only” Origins / Locations / Parents

https://blendermarket.com/products/wrap-in-plastic

With this almost free add-on you can quickly wrap any object with a plastic cover. The thickness, smoothness and the color of the plastic can be customized. You can also wrap multiple objects together by joining them beforehand (this is further explained below).

https://blendermarket.com/products/light-wrangler

Intuitive Placement. Powerful Customization. Realistic Effects. Streamlined Automation. From HDRI to Gobo to IES. Light Wrangler is the ultimate lighting solution for Blender.

https://aescripts.com/shadow-studio/

Procedural traffic in less than 3 words - Absolute no brainer !!! (customizable, realistic and fast) So simple even SpongeBob could handle it! (btw your potato notebook will be fine)

https://deanzarkov.gumroad.com/l/stylized_hair_pro

This add-on works, with versions of Blender of 4.00 and above. Using it with older versions might cause malfunction!  It is focused on working with the hair curves system in Blender, but I've also adapted it to be able to work with other curves (bézier , paths) in the more traditional way of stylized hair creation.  It features a lot of tools to create and control hair curves - from their shape, geometry, materials, ornaments, and even animating them with a Hair Dynamics system. For the full set of features, watch the explainer video.

Bézier Toolkit v0.9.96 for Blender

Ucupaint is a Blender addon for managing textures as layers for Eevee and Cycles render engines.

AddMirrorObject - Blender 2.8 Add-on
3 PY | 24 KB

https://maroc777772.gumroad.com/l/IvyGeneratorPro

Ivy Generator Pro Addon For Blender allows you to draw an Ivy on a surface.

Imperfect! - an addon for Blender that allows you to create instantly realistic projects where you need to add maps of roughness, scratches, etc. 

https://blendermarket.com/products/hdri-maker

https://blendermarket.com/products/true-sky

True-Sky just got a complete night system with automated day/night transitions, procedural and HDRi night skies so you're never stuck deciding on the right lighting for your creative mind!

https://blendermarket.com/products/trimflow

Trimflow is a Blender add-on designed to add repeating patterns like ornaments or stitches to objects in a non-destructive way. It is very similar in approach to Substance Painter's Path tool, but utilizes trims instead of brushes.

https://blendermarket.com/products/bakemaster

 

We all know that models with loads of geometry require way more computer power to render. On the other hand, lowpoly model is easier to handle, and you can transfer high-resolution details onto it. This is called texture baking, and BakeMaster delivers everything you need to get it fast and of the highest quality.

https://blendermarket.com/products/sanctus-library-addon---procedural-shaders-collection-for-blender

 

The Decal Tool (Blender v3.5+). Sanctus Library has a non-destructive real time Decal Placing Tool with currently 352 images.

https://blendermarket.com/products/random-flow

Random Flow is a random mesh generator designed for fast and easy hard surface prototyping and concept art. This a fast changing add-on with lots of new functionalities in the future.

https://blendermarket.com/products/materialiq

Materialiq v5.0.1 Material Library is a material library for the free and open source Blender software. It was designed from the ground up to handle time-consuming tasks that often involve creating and modifying materials rather than focusing on other important aspects of a scene. Blender resource browser integration, random material setting for each element/object, 20 new materials added (6 roof types, 12 wood types, 2 wall types), 14 materialiq4 materials ported to materialiq5, higher resolution material previews, ported world settings via materialiq4, shortened material names in polygoniq browser, added 4 water materials (animation only in aquatiq)

https://blendermarket.com/products/auto-rig-pro

Auto-Rig Pro is an addon for Blender to rig characters, retarget animations, and provide Fbx/Gltf export, with presets for Unity, Unreal Engine, Godot. First developed as my own in-house rigging tool, i've released it a few years ago and it expanded quickly thanks to great support from the community!

https://blendermarket.com/products/quick-physics

Introducing Quick Physics, a user-friendly Blender addon designed to simplify your simulation tasks. With Quick Physics, you can effortlessly add realistic physics simulations to your Blender projects with just a few clicks.

https://blendermarket.com/products/humgen3d

 

Human Generator is a Blender add-on and comes with full customer support for use in Blender, but currently not for other 3D software.

https://blendermarket.com/products/conform-object

For any 3D modeler that needs to project objects onto another object surface in one direction.

The add-on handles the complexity of doing this for you in a non-destructive way, using the source object's location and orientation to project it onto the target object's surface.