Update README.md

Author: enekomartinmartinez

README.md

@@ -33,7 +33,7 @@ For standard methods for data analysis with SD models, see the  [PySD Cookbook](
 
 ## Why create a new SD simulation engine?
 
-There are a number of great SD programs out there ([Vensim](http://vensim.com/), [iThink](http://www.iseesystems.com/Softwares/Business/ithinkSoftware.aspx), [AnyLogic](http://www.anylogic.com/system-dynamics), [Insight Maker](http://insightmaker.com/), and [others](http://en.wikipedia.org/wiki/List_of_system_dynamics_software)). In order not to waste our effort, or fall victim to the [Not-Invented-Here](http://en.wikipedia.org/wiki/Not_invented_here) fallacy, we should have a very good reason for starting a new project.
+There are a number of great SD programs out there ([Vensim](http://vensim.com/), [iThink](http://www.iseesystems.com/Softwares/Business/ithinkSoftware.aspx), [AnyLogic](http://www.anylogic.com/system-dynamics), [Insight Maker](http://insightmaker.com/), and [others](https://en.wikipedia.org/wiki/Comparison_of_system_dynamics_software)). In order not to waste our effort, or fall victim to the [Not-Invented-Here](http://en.wikipedia.org/wiki/Not_invented_here) fallacy, we should have a very good reason for starting a new project.
 
 That reason is this: There is a whole world of computational tools being developed in the larger data science community. **System dynamicists should directly use the tools that other people are building, instead of replicating their functionality in SD specific software.** The best way to do this is to bring specific SD functionality to the domain where those other tools are being developed.