Mac OSX alternative for TextWrangler
TextWrangler was always a feature-subset of the paid, full-featured BBEdit, from barebones.
Without a paid license, BBEdit runs just like TextWrangler &amp; is a direct replacement for it. 

Same maker, same look, same feature-set, opens all your saved documents, runs without an added license. The only action you need to do is install the app. 

Ref: BBEdit FAQs for TextWrangler Customers