Practical guide · verified against the real thing
Open source: what 'free' actually means, and how the companies behind it make money
In one line: Open source is free as in freedom and often free as in price — but not free as in no-cost-to-run, and the projects are businesses. Here is the honest picture before you rely on one.
"Open source" is widely used and widely misunderstood. It does not simply mean free, and the projects you depend on are usually sustained by companies with real business models. Understanding both makes you a better user — you will rely on the right projects, support the ones worth supporting, and not be blindsided when a licence changes.
What open source actually guarantees
Open source means the source code is available under a licence that lets you inspect, use, modify and share it. That is freedom, and it brings real benefits: you can audit what the software does (a genuine security and privacy plus), you are not locked to one vendor, and the project can outlive any single company. It does not guarantee the software is free of charge, free of support cost, or free of the effort to run it — "free as in speech," not necessarily "free as in beer."
How the projects make money
Most substantial open source is backed by a company that monetises around the free core: paid enterprise support, hosted versions (the SaaS form of the same tool), premium features, or dual licensing. This matters to you because it explains the incentives — and the risk. A project can change its licence to pull features behind a paywall, or a company can shut down and the hosted version with it. The healthy ones are transparent about this; the sustainability question is the same one behind lock-in and portability, because open code you can fork is the ultimate portability.
When to choose it
Open source is often the right call for infrastructure and tools where inspection and freedom matter, and where a free, well-maintained project beats a paid black box — the desk's free software alternatives lean on exactly this. But apply the same sobriety as any software choice: check the project is actively maintained (an abandoned project is a security liability, per vulnerability scanning), understand who sustains it, and know what running it will cost you in time. Free to download is not free to own — and the honest version of that trade is the whole decision.
Next