Do you know the best criteria for evaluating 3rd party software?

At SSW we evaluate and use a lot of 3rd party libraries. Before considering a library for further evaluation we ask the following questions:

• Is it open source?
• Is the licence LGPL, Apache, or MIT? Comparison of licences
• Is there a quick start guide?
• Is there a FAQ?
• Is there an API guide?
• Is it easy to install? Is there a NuGet package?
• Is there an active user community?

If the answer is yes to all of these questions then the library is definitely worth further evaluation.