The best definition of the framework can be found in Aurelia official docs −
Web Standards − This is one of the cleanest modern frameworks, completely focused on web standards without unnecessary abstractions.
Extensible − The framework offers an easy way to integrate with the other needed tools.
Commercial Support − Aurelia offers commercial and enterprise support. It is an official product of Durandal Inc.
License − Aurelia is open sourced and licensed under MIT license.
Aurelia is very clean. If you follow the frameworks conventions, you can focus on your app without the framework getting in your way.
It is also easily extensible. You can add or remove any tools that the framework offers and you can also add any other tools that aren't part of the framework.
Aurelia is very easy to work with. It is directed towards developers’ experience. It saves you lots of time.
The framework itself is directed towards web standards so you will always stay up to date with modern concepts.
Aurelia doesn’t have the largest community out there, but it is very agile, knowledgeable and willing to help within short notice.
There are no major limitations. The Framework is powerful and easy to work with.