A good general compilation of useful resources for startups can be found here: http://startupmelbourne.com/resources. Some of it is Melbourne focused, but most of it is more broadly relevant.
Another is http://growth.supply/free/all, where everything listed is freely available. Hundreds of free resources are listed, ranging from website creators, SEO services, image editors, learning resources, logo services, and many more. You’ll need a cup of coffee and a good couple of hours to make your way through the list!