The free version of Evernote is an excellent tool for your project management. It is not only a tool to store just a few notes but rather a tool to store literally all your notes, ideas, schedules, project plans, to-do lists, etc. And it lets you create an endless list of notebooks, not just one. You can have a separate notebook for each of your projects and organize its content any way you like.
In your notebooks you can store not just text but also pictures, links, files, and even grab content from the web (with the Evernote Web Clipper). This basically means that you will have everything in one place, not scattered around in many places which can be easily forgotten or overlooked.
And if this is not enough then the fact that all content is synched to the cloud and accessible from literally all devices and the option for collaboration with others (up to 250 people) should be convincing enough to give this tool a try.
Everything in Evernote instantly syncs across any computer or phone you use. Start working on one device and continue on another without ever missing a beat.
Available for: Windows, Mac, iPhone, Android