Updating readme

README.md

@@ -1,5 +1,14 @@
 # pixelutils
+A collection of random things I think could be useful for those using the [Pixel](https://github.com/faiface/pixel) library.
 
-* [QuadTree Collision Detection](https://gamedevelopment.tutsplus.com/tutorials/quick-tip-use-quadtrees-to-detect-likely-collisions-in-2d-space--gamedev-374)
+## Available Tools
+* Sprite Packer:
+ Runtime packer based on [rectpack2D](https://github.com/TeamHypersomnia/rectpack2D).
+* ID generator:
+ Thread safe integer ID generator.
+* Ticker:
+ My attempt for an easy-to-use framerate limiter.
+
+## Planned
 * [Voronoi Diagrams](https://github.com/pzsz/voronoi)
 * [AStar Pathfinding](https://github.com/fzipp/astar)