There are many alternatives to iWeb for Mac and since it's discontinued a lot of people are looking for a replacement. The best open source Mac alternative is Jekyll. If that doesn't suit you, our users have ranked more than 50 alternatives to iWeb and eight of them are open source and available for Mac so hopefully you can find a suitable replacement. Other interesting open source Mac alternatives to iWeb are Hugo, Gojekyll, Bridgetown and MiddleMan.
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.
Gojekyll is a partially-compatible clone of the Jekyll static site generator, written in the Go programming language. It provides build and serve commands, with directory watch and live reload.
In a nutshell, Bridgetown is a static site generator. You give it text written in an author-friendly markup language like Markdown, and it uses layouts and templates to build a website and save the compiled HTML, CSS, and Javascript to an output folder.
Middleman is a static site generator using all the shortcuts and tools in modern web development. Check out middlemanapp.com for detailed tutorials, including a getting started guide. You can also follow @middlemanapp for updates.
Quanta is an open source, PHP-based Content Management System that doesn't use a database, thought for the development of next-generation web applications.
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Hugo is a command line based environment for generating static sites. Can't think of anything further from iWeb