A fantastic 5-part written tutorial series by Alan Zucconi about shaders in Unity. For developers with little to no knowledge about shaders.

Jasper Flick creates the best written Unity tutorials.

A written 10-step tutorial by Derek Yu on how to draw pixel art. Very informative and easy to follow.

Recently a VFX artist named Kevin Leroy posted a bunch of fan-made League of Legends ability effects made in Unity on Reddit, and they are easily some of the best VFX I've seen in Unity.

Sebastian Lague is my favorite Unity tutorial creator.

A ridicoulous collection of spectacular articles by Amit Patel about algorithms related to game development. His interactive examples are mind blowing.

Jonathan Parham makes fantastic written tutorials for Unity.

A written tutorial by Rafal Wilinski on how to create an animated particle sea effect in Unity. Shows how to manipulate a particle system through code and how to use Perlin noise.

A seamless editor extension for Unity which gives you very intuitive handles for editing 2d joints. A must have if you do any work involving 2d joints. Made By Firtina Ozbalikci.

A Diablo orb shader created by Mourelas Konstantinos. This effect looks practically identical to the health and resource orbs in Diablo 3.

4 different approaches towards making some great looking outline, selection or highlight effects in Unity.

A really cool shader by Ronnie Moe. Just throw this on a plane and you have water which looks like the water in Monument Valley.

Vision cone created with a procedural mesh. Can be used for enemy line of sight, cameras etc. Made by Ben Redahan.

This asset, made by Ryan Nielson, ensures everything in your game is aligned to the pixel grid at all times.

This post processing effect made by Pavel Dobryakov perfectly mimics the frosted glass look used a lot by Apple in both iOS and OS X.

The best antialiasing currently available for Unity if you're using deferred shading and it's completely free and open source. Created by Thomas Hourdel.

A completely free and open source screen space reflections image effect created by Ben Hopkins.

Brilliant looking volumetric light effect which can be used to generate lightshafts on directional lights and spotlights. Created by Robert Cupisz.

A fantastic article about actually finishing a game by Derek Yu. Useful for any up-and-coming game developer.

A really cool article by Artyom Sovetnikov about implementing blend modes like overlay, multiply, color dodge etc. in Unity.

A short, but very informative video by David Rosen on one way to approach player detection in a stealth game.

An amazingly detailed breakdown of the graphics in Grand Theft Auto 5 written by Adrian Courrèges.

A fantastic talk by Adam Noonchester on how the AI for the enemies in Sunset Overdrive was implemented. 

A very detailed breakdown by Simon Schreibt on how the mushroom explosions in Fallout 4 were made.

An article by Simon Schreibt on how to create lens flares using vertex colors rather than textures enabling them to be scaled infinitely with no loss in quality.

A great talk by Bronwen Grimes about creating the content needed to drive an economy for Counter-Strike: Global Offensive.

Lessons Learned Making Gunpoint Quickly Without Going Mad

A great GDC talk by Jane Ng about making a big open world game in Unity as a small team and the challenges associated with that.

A great article by Derek Yu about how Spelunky on XBLA came to be. 

This project is still available on the Asset Store, but for how long? I'm hosting it here just in case. It's an excellent project with a lot of value.

My favorite Unity example project. The character model is excellent, but so are most of the assets in this project and some of the scripts are really useful.

Outdated by today's standards, but the track itself is fun to play around with and can be used to prototype a racing game. The car model is also pretty neat and there are some cool scripts.

Easily the highest quality example project Unity has made. Looks fantastic, even by today's standards. You can make your own Mass Effect game using these assets.

The original Unity tutorials as far as I'm concerned. A piece of Unity history, as well as some cool assets and scripts.

This project has extremely high quality textures. A lot of very high quality 4K normal map detail textures for example. A single one of these textures was almost 130MB before I compressed it.

An introduction to the Stealth project, including what will be covered in the tutorial episodes.

Learn how to make an isometric survival shooter game with this project from Unite training day 2014.