Linus Torvalds (born 1969) created two pieces of software that became foundational infrastructure for the FOSS movement: the Linux kernel (1991) and the Git distributed version control system (2005).
The Linux kernel announcement in August 1991 — famously modest ("just a hobby, won't be big and professional") — initiated what became the largest collaborative software project in history. By the time Torvalds posted the announcement, Stallman's gnu-and-free-software-1983-1997 project had produced most of the tools needed for a complete operating system; Linux supplied the missing kernel. Torvalds released Linux under the gpl-v2, which he has consistently refused to upgrade to gpl-v3, citing concerns about the anti-tivoization provisions and the involvement of patent clauses. "I'm an engineer, not a philosopher" is his characteristic stance on ideological questions.
Torvalds's governance model for the Linux kernel exemplifies bdfl-governance: he holds final commit authority and has maintained it for over three decades, even as thousands of contributors work through a lieutenant system of subsystem maintainers. His temperament — notoriously harsh in code review — became a flashpoint: in September 2018 he took a temporary leave to work on improving his behavior, and the kernel community adopted a formal Code of Conduct.
Git (2005) emerged from a practical crisis: the Linux kernel had been using the proprietary BitKeeper system, whose free license was revoked. Torvalds wrote Git in weeks as a replacement. Git's distributed model — every clone is a full repository — transformed how FOSS collaboration works, enabling github-platform and the pull-request workflow that now dominates the industry. The relationship between patch-based-development and Git-based development is one of the central transitions in modern FOSS practice.
Torvalds is employed by the linux-foundation, which provides institutional support for his continued work on the kernel.
The bazaar-model described in cathedral-and-the-bazaar-1997 was largely theorized from observing the Linux kernel development process, though Torvalds himself has rarely engaged with the theoretical literature about his project.