Alternatives to SoapUI

I've found that although SoapUI is very useful, it can be extremely clunky. It takes up a dramatic amount of resources on either my Ubuntu or Windows boxes.  So, I found some great browser plugins that can do the exact same thing. I've fallen in love with Postman Rest Client. I mean who couldn't love a plugin named after an awful Kevin Costner film?!?!  Anyways, you can find many other plugins for both Firefox and Chrome.  Just Google chrome rest client OR firefox rest client do look at the many options available to you.  You're bound to find one that you like.  Cheers!