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We have sunsetted TextWrangler, and so are encouraging all TextWrangler customers to switch to BBEdit, which is identical to TextWrangler in every way that you're used to, because it's built on the same foundation from the same developers.
BBEdit offers a 30-day evaluation period, during which its full feature set is available. At the end of the evaluation period, you can continue to use BBEdit for free, forever, with no nag screens or unsolicited interruptions.
After the evaluation period, BBEdit provides a modified set of features, which incorporates all of TextWrangler's features plus unique features of its own. In the best tradition of TextWrangler, using BBEdit in this fashion costs you nothing, while providing an upgrade path to advanced features and capabilities.