There are many alternatives to iWeb for Mac and since it's discontinued a lot of people are looking for a replacement. The best Mac Blog Publishing Tool alternative is Jekyll, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to iWeb and three of them are Blog Publishing Tools available for Mac so hopefully you can find a suitable replacement. Other interesting Mac Blog Publishing Tool alternatives to iWeb are Hugo and Zox.
Jekyll is a simple, blog aware, static site generator. It takes a template directory (representing the raw form of a website), runs it through and Liquid converters, and spits out a complete, static website suitable for serving with Apache or your favorite web server.
Hugo is a general-purpose website framework for generating static web pages. Hugo flexibly works with many formats and is ideal for blogs, docs, portfolios and much more.
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Hugo is a command line based environment for generating static sites. Can't think of anything further from iWeb