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:

Online Fishing Planet game .

If you are a fishing enthusiast, this game is a pleasant and relaxing realism.
It is a manager where you will spend your money on fishing gear and you will find world-class competitions.
The development team comes with this intro:

  Fishing Planet is a FREE to play unique and highly realistic online first-person multiplayer fishing simulator developed for anglers to bring you the full thrill of actual fishing! Choose your lures, make your trophy catches, discover new possibilities and sharpen your real angling skills anywhere, anytime 

Features:
72+ species of fish, each with its unique behavior and AI.
12 scenic waterways with multiple locations, various climatic conditions, bottom terrains and vegetation.
Thousands of tackle combinations with unique physical and hydrodynamic properties.
Superb dynamic water graphics with ripples and surface that changes depending on wind, current and depth.

You can play this game on Windows od Linux (Ubuntu) with this system requirements:

SYSTEM REQUIREMENTS
OS: OS Version - Windows 7, 8, 10 x64
Processor: Dual-Core 2.4 Ghz
Memory: 4 GB RAM
Graphics: Graphics Card Intel HD4600 or higher DirectX: Version 11
Network: Broadband Internet connection Storage: 12 GB available space
Additional Notes: External mouse or compatible Xbox controller required 
Read here.

The cubebrush website accepts bitcoin.

As you know already the Cubebrush website is the first and largest marketplace for digital art resources.
Now the Cubebrush website team accepts cryptocurrency as a payment method.
Read about the new option here.
We're extremely excited to inform you that as of today, we now accept Bitcoin (plus Bitcoin Cash, Ethereum & Litecoin) as a payment method. 

Bitcoin is a decentralized P2P currency that enables instant payments. You will now be able to use cryptocurrency to purchase curated CG tutorials, 3D/2D assets and much more on Cubebrush.

OpenProcessing website.

You can create an account on this website to test your skills with processing programming language.
About OpenProcessing then this programming language uses some awesome Licensed and Open Source components.
You can see my working sketches here.

Castle Clash: Heroes of the Empire US.

The IGG team comes with this info about this game:
...Castle Clash is a game of epic kingdom wars! Hire powerful Heroes and equip them with legendary weapons to lead your mighty army of mythical creatures. Fight your way to become the world's greatest castle warlord. Put your strategies to the test in dungeons, raids, wars, arenas, and missions!...

Elvenar - the online game.

The team comes with this intro for this online game:
Welcome to Elvenar! Elvenar is a free-to-play browser-based game, where you will build a flourishing city and discover a magical world full of mysteries. Build up the most beautiful city and establish the most efficient economic system that you can! In Elvenar you can upgrade almost every building, improving the productivity and the look of your city. Explore the vast World Map to acquire the knowledge of your wise ancestors and discover new technologies. Trade or fight over powerful Relics to boost your production. You can either become a skilled and well-known trader, refine your producing art or lead your troops to victory in 3D-animated battles, the decision is up to you.
You can see a video intro from the official youtube channel:

News : NVIDIA VMware Test Drive.

The NVIDIA VMware Test Drive gives you instant access to hours of accelerated, virtualized graphics—for free.
You can start with:

• FREE 90-DAY EVAL 
• PURCHASE NVIDIA VIRTUAL GPUs:  just for these countries: Brazil, China, France, Germany, India, Italy, Japan, Latin, Poland, Russia, Spain, Turkey, United Kingdom.

Read more about this feature here.

Free textures from texturehaven .

The team from the texturehaven website come with this info:

100% Free 
All textures are licensed as CC0 and can be downloaded instantly, giving you complete freedom. 
No paywalls, email forms or account systems.

You can help this website:

With Patreon, you can contribute to help us pay the server cost and develop new texture scans.
When a goal is achieved, something new will come.
Think unlocking 8k textures, PNG files, increasing uploads and more.
Not only can you contribute financially, but you can get directly involved in the process, helping decide what textures we shoot, and ultimately the direction this site is going. 
Spendings of donation each month is verified by public finance reports.

Mythology : Contest created by HUION .

The contest is created by the HUION graphic tablet company.
The theme of the contest is Mythology.
Awards are in HUION products.
Subscription deadline: 15 November 2018.
See more detail here.

The Magicavoxel tool for your game development.

The development team tells us:
"A free lightweight 8-bit voxel editor and interactive path tracing renderer, made with love by @ephtracy. Available for PC and MAC. This is where it all begins.

This tiny light-weighted software is the core of voxelart, since it is capable of many things : just edit, paint and move your voxels in a cubic grid, then animated them and render them with the powerful integrated renderer.

License : feel free to use it for any project, no commercial licences required, credits are appreciated"
Let's see this video tutorial from youtube channel:

Smart tool - the online unknown tool.

I found this online tool for developing games.
The tool can:

• Load and Save image files;
• Change settings for a normal map texture;

I don't find the provider of this tool...
They say:
Error 404 - Not found 
Die angegebene Seite konnte nicht gefunden werden.
See the screenshot with this tool:

Thunkable : Create online mobile applications for iOS and Android.

Thunkable is the platform where anyone can build their own mobile applications for iOS and Android.
This online tool is free to use with a google account.
The Thunkable platform charges a maintenance fee for the use of certain components such as Ads by AdMob and Payment by Stripe.
You can start build your on an app is as simple as dragging and dropping your favorite components and connecting them together with blocks.
Learn how to make your first app from this video from official youtube channel: