Robinhood - Free stock trading service.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
Rally Rd. - Invest in blue-chip classic cars like stocks
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Freetrade - Invest in stocks & ETFs for free, get started in seconds.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.