News : Blender 3D the beta version.

In this video, Pablo Vazquez presents the 5 major updates in Blender 2.8 Beta.
As you already know, the Blender 3D is free and you can support core Blender development here.

Use offline Slate editor.

Named Slate this software is a simple editor.
This editor can be easily used to create drawings and simple art like pixelart.
The good part of this editor is simple to use and can be used offline.
This is a screenshot of this software:

More about this editor can be found at GitHub website page.

Make online sprite with pixilart.

This is a simple drawing tool with simple features like an editor with some basic features.
This tool comes with a community art online.
This online tool comes with an application on google play.
Create pixel art on the go. Pixilart is a community of passionate art enthusiasts who enjoy pixels. Easily make pixel art, and then share your art and even follow others who have created their own pixel art creations.
You can test your 2D drawing skills here.

Unity 3D : Unity 2D Challenge.

Here's an unexpected opportunity for Unity 3D game developers to develop 2D games.
About this challenge the Unity team come with this info:
The prizes:
1st - $2000
2nd - $1000
3rd - $500
Special Mention - $500
Join the Unity 2D Challenge to become part of an exciting community journey exploring the possibilities of our new 2D tools.
How to participate 
Create a small piece of content using Unity’s 2D tools. It can be anything from pixel-perfect retro-style art to a snippet of hand-drawn platforming gameplay or a thin vertical slice of a 2D competitive brawler. Anything goes, as long as it’s 2D. See the FAQ at the bottom for more info.
See this video intro: