https://assetstore.unity.com/packages/vfx/shaders/fullscreen-camera-effects/skybox-blender-186047

Transition from one skybox to another in a smooth and soothing fashion. Can be used for something like a day/night cycle. WHAT IS SKYBOX BLENDER?

https://assetstore.unity.com/packages/vfx/shaders/beast-advanced-tessellation-shader-82066

Beast is an advanced tessellation shader integrated into Unity's Standard (for Built-in RP) and Lit (for Universal RP) shaders and offers:

Skinned Mesh Combiner MT – Character Mesh Merge, Atlasing Support & More (v3.4.12)

Skinned Mesh Combiner allows you to combine your characters’ Skinned Meshes in a very simple and intuitive way. Merging can be done in the Editor or in Runtime. Also, the merge will not affect your character, your animations and other things will remain intact even after the merge. The SMC can convert Non-Skinned meshes to Skinned and then merge them together, normally, with the character. With SMC you can also undo an already made merge, make your changes and then merge again!

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This addon integrates car/4-wheels multiplayer vehicle controller into MFPS, allowing you to add this type of vehicle in your game maps to allow players to enter/exit these vehicles in-game, drive them around on the map with other players as passengers that also can shoot from inside of the car making the game much more exciting and engaging. The integration is a 2-clicks process; you can add as many cars as you want and as many passenger seats per vehicle as you desire. It is easy to add new vehicle models and fully customizable properties.

 https://www.lovattostudio.com/en/shop/template/vehicle-car-beta/

https://www.lovattostudio.com/en/shop/addons/waiting-room-pro/

This add-on adds more features to extend and improve the Waiting Room feature that comes by default in MFPS.

Glaz Underwater FX (v1.3.1)

https://assetstore.unity.com/packages/tools/particles-effects/glaz-underwater-fx-127259

The Built-in Render Pipeline is Unity’s default render pipeline. It is a general-purpose render pipeline that has limited options for customization. The Universal Render Pipeline (URP) is a Scriptable Render Pipeline that is quick and easy to customize, and lets you create optimized graphics across a wide range of platforms. The High Definition Render Pipeline (HDRP) is a Scriptable Render Pipeline that lets you create cutting-edge, high-fidelity graphics on high-end platforms.

Amplify Impostors v0.9.9.3

Amplify Impostors is a powerful tool to build geometrically simplified, albeit volumetrically accurate, representations of complex models using a modern version of the classic billboard technique.