Linux is supported by a distributed network, not a single founder or company. Kernel contributors write and test changes, maintainers review and coordinate them, employers fund much of the work, and users and project communities provide documentation, bug reports, testing, infrastructure and money. The Linux kernel is only one part of the wider ecosystem of distributions, applications and services, each with its own people and funding arrangements.
Who supports Linux?
Support comes from several connected groups:
- Contributors submit code, documentation, tests and other project work. They include first-time participants and developers with years of subsystem expertise.
- Maintainers review proposed changes, coordinate subsystem trees and decide which work is ready to move forward.
- Companies and other organizations employ developers, provide infrastructure and fund engineering time.
- Project communities and users report problems, test releases, improve documentation, answer questions and sometimes provide direct funding.
- Organizations such as the Linux Foundation provide collaboration infrastructure, operational services and reporting; they do not replace maintainers’ technical authority.
These roles overlap. A developer may contribute as an employee, a consultant or an independent volunteer, while a distribution or application community may have a separate set of maintainers and sponsors.
Who writes the Linux kernel?
The Linux Foundation’s 2025 reporting identifies 2,057 developers who contributed to the Linux 6.16 kernel release. Of those, 310 submitted their first kernel patch. The same report describes Linux releases as the result of thousands of contributors worldwide and hundreds of organizations. The two precise figures are specifically for Linux 6.16; the broader description should not be read as a headcount for every Linux project.
What contributors do
Contributors propose changes to code and documentation, investigate bugs, test patches and respond to review. New contributors can work on a narrowly defined fix, while experienced developers may own knowledge of a subsystem and help guide its design.
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What maintainers do
Maintainers are the coordinators between submitted work and an accepted kernel change. They review patches, request revisions, resolve conflicts and send selected work onward through the kernel’s development hierarchy. In a kernel-development presentation, Greg Kroah-Hartman highlighted the maintainer role and patch-acceptance process. The presentation quotes David Miller: “Maintainers are like editors in the publishing industry.”
The practical submission rules evolve, so anyone sending a patch should use the current kernel documentation and the relevant subsystem’s instructions rather than relying only on a presentation from 2020.
Which companies contribute to Linux?
Corporate participation is substantial, but contribution shares do not establish that any company controls the kernel. Developers may contribute on company time, through consulting work or independently, and a single patch can pass through review by people from several organizations.
For kernel releases 5.4.0–5.9.0 (September 2019–October 2020), Greg Kroah-Hartman’s presentation categorized contributions in a section titled “Who is funding this work?” The period-specific figures were:
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| Category | Share | Scope |
|---|---|---|
| Amateurs | 13.5% | Kernel releases 5.4.0–5.9.0 |
| Intel | 11.6% | Kernel releases 5.4.0–5.9.0 |
| Red Hat | 6.6% | Kernel releases 5.4.0–5.9.0 |
| AMD | 4.9% | Kernel releases 5.4.0–5.9.0 |
| Huawei | 4.8% | Kernel releases 5.4.0–5.9.0 |
| 4.7% | Kernel releases 5.4.0–5.9.0 | |
| Linaro | 3.8% | Kernel releases 5.4.0–5.9.0 |
| SUSE | 3.6% | Kernel releases 5.4.0–5.9.0 |
| IBM | 3.1% | Kernel releases 5.4.0–5.9.0 |
| Consultants | 2.7% | Kernel releases 5.4.0–5.9.0 |
These are historical categories for a defined release window, not a current ranking and not a complete measure of every form of support. Current project-level contributor dashboards and reports can use different definitions, so old percentages should not be presented as today’s leaderboard.
Are Linux developers paid?
Some are paid by employers or clients; others contribute independently. Open-source licensing describes how software can be used and shared, not whether the people producing it receive wages.
A Linux Foundation summary published in 2017 reported that 8.2% of contributions came from unpaid developers, down from 11.8% in 2014, for the period covered by that report. Those figures are historical and should not be used as a current estimate of unpaid Linux work. They also do not imply that the remaining contributions all came from one type of employer: the ecosystem includes companies, consultants, independent developers and other arrangements.
Does Linux depend on volunteers?
Volunteers are part of Linux, but the kernel’s scale also depends on sustained, paid engineering and organizational resources. Companies support employees working on kernel code; organizations provide testing and infrastructure; independent developers contribute time; and maintainers coordinate the result. The balance changes by project and over time.
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The Linux kernel should not be confused with every distribution, desktop environment or application. An individual project may rely heavily on volunteers, paid maintainers, grants, sponsorships or a mixture. There is no universal fund that automatically covers all Linux software.
What does the Linux Foundation do?
The Linux Foundation provides a home and operational support for open-source collaboration and publishes reports about kernel activity. Its education program issued 45.8 thousand certifications in 2025; that is a foundation-wide education figure, not a count of Linux-only certifications and not a measure of kernel contributors.
For eligible open-source projects, the Foundation’s LFX Crowdfunding service describes financial management, legal and compliance support and fund administration. Eligibility depends on the project’s active community and clearly documented funding needs. A contribution through such a service is project-level support; it does not automatically send money to a particular developer, and the service’s fees and terms should be checked when you act.
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Choose the work you want to strengthen
Decide whether your goal is the kernel, a distribution, an application, documentation, testing, community support or shared infrastructure. The right recipient and contribution process depend on that choice.
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Contribute skills and time
- Choose a project or a concrete problem area.
- Read the project’s current contribution, coding and review instructions.
- Start with an appropriately scoped task, such as reproducing a bug, improving documentation or adding a test.
- Submit work through the project’s documented review process and respond to feedback.
For kernel work, identify the relevant subsystem and follow its current maintainer and patch guidance. A technically correct change can still be rejected if it misses the project’s process, formatting or review expectations.
Provide money transparently
Identify the exact project, then check who receives funds, whether the project publishes a budget or use-of-funds explanation, what eligibility rules apply and whether the arrangement supports a named developer, a project team or shared infrastructure. A foundation-hosted mechanism can simplify administration for eligible projects, but it is not a universal donation route for all Linux software.
Learn without assuming a credential is required
Linux Foundation education and certification are available learning routes, but a specific course is not established as necessary for contributing, and no affiliate opportunity is established here. Many projects instead document their own technical guides, mailing lists, issue trackers and mentoring channels.
How to judge a Linux support claim
- Check the scope: distinguish a kernel release from a distribution, application or the broader ecosystem.
- Check the date: contributor counts and company shares are tied to particular releases or reporting periods.
- Check the role: funding, code contribution, review and governance are different forms of support.
- Check the destination: confirm whether money reaches a project, foundation-hosted fund, employer-supported team or named individual.
- Check the evidence: do not turn historical percentages into a current ranking.
Linux persists because these roles work together: people write and review code, organizations sustain the work, and communities test, document and improve it. No single person or institution represents all of Linux.
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