I have 2 kind of things in here :

Asset Store Works

They are not free, but they feed me!! They are all very niche asset.

Introloop - Easily play looping music with intro section.

http://exceed7.com/introloop/

Native Audio - Lower audio latency via OS's native audio library.

http://exceed7.com/native-audio/

Native Touch - Faster touch via callbacks from the OS, with a real hardware timestamp.

http://exceed7.com/native-audio/

Open source Unity stuff

Free! But please fix bugs for me too!

Notch Solution

https://github.com/5argon/NotchSolution

It is a set of tools to fight with notched/cutout phones for Unity uGUI.

Enum Dispatcher

https://github.com/5argon/EnumDispatcher

ECS backed C# enums as Flux/Redux action in Unity.

ECS Line Renderer

https://github.com/5argon/ECSLineRenderer

Pure ECS approach to render a line. One Entity per one line segment.

Firestorm

https://github.com/5argon/Firestorm

Makeshift Cloud Firestore C# API that works with Unity via REST API. Contains only basic functions.

protobuf-unity

https://github.com/5argon/protobuf-unity

Automatic .proto files compilation in Unity project to C# as you edit them. (When did it goes up to 100 stars wtf)

E7Unity

https://github.com/5argon/E7Unity

Common Unity resources I uses in my own projects.

E7ECS

https://github.com/5argon/E7ECS

Misc stuff I made for Unity ECS.