BillGrid.com - BillGrid is an easy to use online invoicing, billing and expense management system that will save you time with tracking clients projects, expenses, invoices and payments.

Mavenlink - Resource planning, time tracking, project financials, collaborative project management, and performance analytics all wrapped up in one intuitive solution.

ChargeOver - ChargeOver automates recurring billing, subscription billing, & payment acceptance. A SaaS that integrates with Xero, Quickbooks, & has an API. Free trial.

Hub Planner - Transparent Resource Scheduling, Timesheets, Vacation, Resource Requesting, Project Management & powerful Reports in an agile designed, feasible & intuitive software for simple planning

Elorus - A super-easy online invoicing & time tracking software

Grenade HUB - Grenade HUB is the best team planner for agencies, studios and firms which are open to share their talents