itch.io

"Essentials Series" give you 1639 High Quality Free sounds to help you in your projects.

A guide and templates for making your Itch pages look awesome.

A Blender add-on for building tile based low-poly scenes with paint/map editor like tools

A tool to build autotiles and tilesets

From Game Maker's Toolkit

Unity Windows Desktop Library

2D level editor for indies from an industry veteran

Procedural pixel-art tile creator

Create your whole tileset instantly.