Not all projects can be done in one day. But that does not mean you should not pre-announce your work to build buzz for it and keep your visitors updated with your efforts. Coming Soon is a free theme you can install to tell your visitors about your upcoming projects. You can use this to announce your upcoming app, software, and even website.
Coming Soon does not have too many bells and whistle. But it is highly customizable. You can easily change the way your page looks, its product image, and everything else in the backend. Coming Soon is SEO friendly but you should take time to optimize your copy to give your site the best chance to get ranked.
Coming Soon is not the most sophisticated theme in this category. But it is highly customizable and does what it promises well.