Project Management

Hey everybody.
For my new internship my coworkers and I have to collaborate on different files and projects. We are looking for an accessible project management solution, but so far we have had little luck. From what I know google docs is not accessible, am I correct about this? Google makes their stuff seem super great in their documentation, but we know the true story behind most of googles stuff. We have also looked at something called Podio. I have been able to do some things with their web sight, but it does not look like a very accessible option. However, I have not spent much time with it so does anyone have more experience with Podio?
My main question is does anyone know of any good accessible project management Solutions. Thanks