Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Hive - Seamless project management and collaboration for your team.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Sup! Standup Bot - The complete stand-up and follow-up bot
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.