Dynamics ToolBox is not a third-party solution, neither it is a set of javascripts/C# source codes you can use to customize Dynamics. Instead, it’s a set of tools which you should be aware of if you want to work with Dynamics efficiently.
You will find a quick introduction here.
And below is what’s included into the Dynamics ToolBox so far
1. Custom Code
2. Third Party
3. Out Of The Box
4. Random Stuff