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.