Does OS X or Xcode have applications to manage cheat sheet/commands list? I'm learning coding on OS X, as I'm a beginner, I have to read cheat sheets and I have bunch of files like that, Git commands, Ubuntu Server commands, Node.js modules command and so on.

Today I saw my friend using Cloud9, it's Cloud IDE, it has a small area called "Commands" where he can search and read tiny description about it, also keyboard shortcut.

I know that feature is so specific to Cloud9, but do we have similar functionality in some app on OS X, where I can create and store my usually cheatsheets? I don't need 100% exactly the same, just same same is ok.





Update:
I'm going to write my own app, I will let you know if I can archive anything.
Try Dash. 


  Dash is an API Documentation Browser and Code Snippet Manager. Dash stores snippets of code and instantly searches offline documentation sets for 150+ APIs ... You can even generate your own docsets or request docsets to be included.