From Karelia Software:
Sandvox allows to create content-rich, standards-compliant, stylish websites quickly and easily. Just click and drag content to and from your site as you create it and watch your site turn into exactly what you've envisioned. Then, you can publish your new site to whichever host you prefer. Using either the Regular or Pro editions of Sandvox, you'll have everything you need to create the website of your dreams. New website creators can build great looking sites in no time and professional website builders can create sophisticated, websites that show off their webmaster talents in uniquely creative ways. With Sandvox, everyone is a webmaster, no matter how much or how little experience they have.
What's new in this version:
This solves some Sierra-specific issues related to publishing and document language choice, along with some other issues.