FreshBooks - The ideal accounting software for small business owners.
Clio - Clio provides a full suite of web-based practice management tools targeted specifically at the administrative needs of sole practitioners and small firms.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
MyCase - Practice More, Manage Less.
Active Collab - Active Collab — Task management, Team collaboration, Time tracking & Invoicing app
BillMinder - BillMinder is for tracking the record of the bill due date and making it sure that you will never again get late in paying your bills at due date.