Mavenlink is an all in one custom-branded web-application where you can manage projects, share files, track time, invoice clients and receive PayPal payments for your invoices.
As a top-5 all-time application in the Google Apps Marketplace, Mavenlink integrates with your email, Google Docs, Google Calendar, and Google Contacts as well. You can manage your business, collaborate on documents, and work efficiently from anywhere in the world.