Notable examples include open core (sometimes referred to as dual licensing or multi-licensing), software as a service (not charging for the software but for the tooling and platform to consume the software as a service often via subscription), freemium, donation-based funding, crowdfunding, and crowdsourcing. Many of these variations are referred to an 'open core' model, where the companies develop both open source software elements and other elements of value for a combined product.Ī variety of open-source compatible business approaches have gained prominence in recent years, as illustrated and tracked by the Commercial Open Source Software Index (COSSI), a list of commercial open source companies that have reached at least US$100 million in revenue. Pure dual licensing models are not uncommon, as a more nuanced business approach to open source software businesses has developed. Historically, these business models started in the late 1990s and early 2000s as ' dual-licensing' models, for example MySQL, and have matured over time to include many variations, as described in the sections below.

This additional value can be, but not limited to, enterprise-grade features and up-time guarantees (often via a service-level agreement) to satisfy business or compliance requirements, performance and efficiency gains by features not yet available in the open source version, legal protection (e.g., indemnification from copyright or patent infringement), or professional support/training/consulting that are typical of proprietary software applications. Each of these business strategies rests on the premise that users of open-source technologies are willing to purchase additional software features under proprietary licenses, or purchase other services or elements of value that complement the open-source software that is core to the business. Companies whose business centers on the development of open-source software employ a variety of business models to solve the challenge of how to make money providing software that is by definition licensed free of charge.

Open source software for business cards