Here are the list tool sets you will need if you want to design & develop website on mac with opensource or free apps. As you may know Mac is it self based on opensource Unix platform.
So here is the list of Web Design & Development OpenSource Apps available on Mac,
CMS (Content Management System) or Blogging Platform
Wordpress is opensource CMS software for Blogging, Even This website is created with WordPress. WordPress has massive support with large amount of plugins to easily integrating Google Analytics, Google Adsens, Feedburner to even having Image slideshow & Image Lightbox
MAMP is free app to setup free webserver including Apache & MySQL, It helps to run & design wordpress website locally.
Wordpress with it’s edit mode will help you to develop website from scratch
TextWrangler is available on Mac App Store, This App will help you to hand code your website.
GIMP is Opensource Raster base image manipulator program which available for free it supports all popular image formats like PSD, PDF, PNG, JPG etc.
Inkscape is Vector design creation tool available on net for free download & use. It is alternative to paid app like Adobe Illustrator & CorelDRAW
Creating favicon for your website is vary easy with Icomaker. It will go great with GIMP
960 is new design standard to design website using definite Grid in Design
Opensource FTP client for Macintosh…
FileZilla is an Opensource FTP client for Macintosh, It will help you to upload your website to online server.
Firefox is most popular opensource internet browser vailable on most popular operating systems like Mac, Windows & Linux.
So, This was the list of Web Design & Development tools for Macintosh… Happy Designing…!!!
Thanks & Regards