Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Brightflag - External legal spend analytics, management and control
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
TimeSolv - Legal Time Tracking & Billing Software.
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
LexisNexis CounselLink® - Innovative cloud-based software solutions for matter management, e-billing and legal spend management, and analytics. Dedicated support and partnership to help you succeed.