| 386BSD | William Jolitz, Lynne Jolitz | 1992 |
| A2 | ETH Zurich, Niklaus Wirth | — |
| BareMetal | — | — |
| Berkeley Software Distribution | University of California, Berkeley | — |
| BSD Router Project | — | — |
| ChorusOS | Chorus Systèmes, Oracle Corporation, Sun Microsystems, Institut National de Recherche en Informatique et en Automatique | — |
| ChromiumOS | Google | 2009 |
| Cosmos | — | — |
| CP/M | Digital Research, Gary Kildall | — |
| DEMOS | National Research Centre Kurchatov Institute | — |
| DesktopBSD | — | — |
| DragonFly BSD | Matthew Dillon | 2003 |
| DreamShell | — | — |
| FreeSBIE | — | — |
| Frenzy BSD | — | — |
| FuryBSD | — | 2019 |
| House | — | — |
| Jibbed | — | — |
| M0n0wall | — | — |
| MacOS | Apple Inc. | 2001 |
| MicroBSD | — | — |
| MidnightBSD | — | 2007 |
| MikeOS | — | — |
| MINIX 3 | Andrew S. Tanenbaum | — |
| MirOS BSD | — | — |
| NetBSD | — | 1993 |
| NextBSD | — | — |
| Not Another Completely Heuristic Operating System | — | — |
| Nut/OS | Ethernut | 2000 |
| Oberon | Niklaus Wirth | — |
| OSIAN | — | — |
| OSv | — | — |
| Prex | — | — |
| Rodos | German Aerospace Center | — |
| Salix OS | — | — |
| SharpOS | — | — |
| Tinfoil Hat Linux | — | — |
| TinyOS | — | — |
| TI‐RTOS | Texas Instruments | — |
| TrueNAS | IXsystems | — |
| TrueOS | IXsystems, Kris Moore | 2006 |
| Turtlebot | — | — |
| Unununium | — | — |
| Void Linux | — | 2008 |