For my freelance work, I use apollo (apollohq.com), currently pay for the basic plan (and I have a healthy permanent discount for having jumped on during their

For my freelance work, I use apollo (apollohq.com), currently pay for the basic plan (and I have a healthy permanent discount for having jumped on during their beta) and keep both internal projects as well as interface with external clients. So far it's been working well. It pretty much has all the features I need as a freelancer except for invoices (which I take care of with freshbooks).