Google Sites is a free service that allows you to easily create websites and gives you a place to put them online. Since it is web-based, it works on any computer platform, and it does not require you to purchase or download any software. Consider this as an alternative to Dreamweaver or iWeb.
Free 30-day trials of most Adobe software, including Photoshop, Dreamweaver, and Illustrator. Great to try a piece of software before commiting to buying it, and great if you're working on a project and don't need more than 30 days to complete it.