SbTween is plug and play tween library for S&box Editor.
This library adds tween feature to already existing components. (Transforms, Color, float, Screen Panel)
Inspirated by DoTween & GDTween

[Features]
Auto "Inject" - u don't need to add TweenManager to every level. system will add it by itself.
Tweening Component - SbTweenPlayer

Tweens:
Local, World Position
Local, World Rotation
Local, World Scale
Color Tween
Position, Rotation, Scale Shake
Screen Panel Opacity
Float tweener
Spiral, In Circle
Camera Tweens

Easings, Looping
Callouts onComplete, onStart, onUpdate.
Easy system for adding custom tween extensions.

Sequences (inspirated by DoTween)

Example Level. 
> where is showcased every tween.

How to use it?
Example of basic cube movement.
this.TweenMove( new Vector3(25,25,25), 3 ).SetEase( EaseType.Linear ).SetLoops(-1,LoopType.Restart).Play();

Shoutouts:

Braxen (TweenManager) for inspiration.
DoTween, GDTween for inspiration.
Robert Penner for easing equations.

Future
Tweening Component (instead of writing code, you can play or setup tweens in inspector)
Improve quality
Simplify script
I wanna look into razer, scss.