Dubsado - Dubsado is flexible — it gives you 5 (now 6!) ways to add new leads. Best of all, 5 ways are automated.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Harlow - Harlow helps freelancers get organized, save time, and look professional with automated invoicing, proposal templates, and much more—all from one centralized hub.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Hecticapp.com - Hectic is a single digital workspace with all the tools needed to start, manage and grow a freelancing business, with a built-in personalized community to help freelancers connect with others, develop and refine their craft and get help from experts.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.