2D
Nemesis STG Engine 2D
by jamesthe1
Nemesis is an addon/engine that makes sh'mup development easy. Whether you need to create a wave of enemies that explode when destroyed, or a player that can pick up weapon options, all you need are this engine's resources. Requires Godot Mono.
Polygon2d Generator 2D
by vyshliy
Automatic generation of internal points and polygons for Polygon2d
WaterMap 2D
by garrettmakes
Add water physics to any TileMap with a single node!
Godot Volornoi Sweepline 2D
by sinowa
A Godot 4.X add-on that generates and displays a Voronoi diagram using a port of my python implementation of Fortune's sweep line algorithm. V2 update: - Added Lloyd's Relaxation Algorithm(multi-threaded) - Fixed Final Known bugs
Godot Texture Atlas 2D
by kautaruma
Adds support for using Adobe Animate Texture Atlases to Godot. Read the README.md for more info on what is currently supported.
ActionButton
by hapty
ActionButton is a custom Button node with extended audio and visual customization. Features: *Customize how the button animates and looks when you interact with it. *Configure sounds for the button, with a system that keeps track of sounds and reuses them across the project.

GDMatPlot
by dmrokan
This plugin adds GNUPlot terminal to the Godot engine for displaying plots on a 2D canvas layer without requiring GNUPlot executable Checkout demos: https://github.com/dmrokan/gdmatplot/releases/download/v0.3.0/demo.zip https://github.com/dmrokan/gdmatplot/releases/download/v0.3.0/demo3d.zip
Godot Tiled importer 2D
by mistas
Plugin that helps to import tile maps from the Tiled editor.

Animation Frame Picker
by animesuro
A Godot Engine add-on made by AniMesuro that adds a Frame Picker functionality for 2D Animation, allowing for more efficient frame keying on an animation track.
Scene palette 2D
by fabianlc
Instance scenes on your 2D scenes from a palette. Features: -Grid snapping -Flipping and rotation -How the left mouse button with grid snapping on to place an instance when the mouse moves to a new tile -Adjustable zoom on the palette. To use create a scene with the scenes you want in your palette, then enable the panel and load the palette using the file menu. If your editor's language is set to English you can make the palette use the editor's grid snap settings. The visible rect of your sc...
Godot.h8.Palette.gd 2D
by h8man
Godot GDScript tools and shaders for palette swaps, palette animation and index maps
Fancy Fades Scene Changes (Godot 3.x)
by nightblade
Did you ever want a fancy scene change? Look no further - this asset allows you to create buttery-smooth, fancy fades between two scenes, with a single line of code! Supports: - Cross-fades (fade from one scene to the other) - Shader-based fancy dissolves - Scenes that contain entities with cameras This library is in beta, and works well as far as I know. Please report any bugs!