How do you manage your time when working on multiple projects?

So I’ve started working with this awesome web development company, and right now I am there only developer and they have me working on a lot of different projects. I’m finding it hard to juggle between all of them. I was wondering what tips tricks methods, pieces of software you use to help you manage multiple projects. I was using billings but it doesn’t really do what I want it to do anymore since I’m not freelancing and it’s a time tracking app not a time management app.

The company is a small team of about 5 people, 2 project managers, 1 designer, and a sales guy.

If that helps any :)
For software recommendations I’m on a Mac.

Thanks in advance!!