| Android | Google | — | Apache Software License 2.0, GNU General Public License, version 2.0 |
| Android Open Source Project | — | — | Creative Commons Attribution 2.5 Generic, GNU General Public License, Apache License |
| AOKP | George Merlocco | — | Apache License |
| AospExtended | — | 2017 | — |
| Atomic-OS | — | 2017 | — |
| CalyxOS | Calyx Institute | 2020 | — |
| ColtOS | — | — | — |
| CrDroid | — | — | — |
| DarkNess reDefined | — | 2017 | — |
| DD-WRT | — | — | GNU General Public License |
| DotOS | — | 2017 | — |
| Ez-WifiBroadcast | — | — | — |
| FuryBSD | — | 2019 | BSD licenses |
| GhostBSD | — | 2009 | GNU General Public License, 2-clause BSD License |
| Glaze OS | — | 2017 | — |
| GrapheneOS | Daniel Micay | 2016 | MIT License, GNU General Public License, version 2.0 |
| Icaros Desktop | — | — | — |
| LibreELEC | — | — | GNU General Public License, version 2.0 |
| LineageOS | — | 2016 | GNU General Public License, version 2.0, Apache License |
| Maemo Leste | — | — | — |
| MoKee ROM | — | 2012 | MIT License, GNU General Public License, version 2.0 |
| MonaOS | — | — | MIT License |
| OpenKylin | — | — | — |
| OpenTX | Bertrand Songis | — | GNU General Public License |
| OPNsense | — | — | 2-clause BSD License |
| OpuntiaOS | — | — | 2-clause BSD License |
| Pi-KVM | — | — | GNU General Public License, version 3.0 |
| PixelExperience | — | 2019 | — |
| RISC OS | Acorn Computers, RISCOS Ltd, RISC OS Open, Castle Technology | — | freeware |
| Robigalia | — | — | — |
| RubyFPV | — | — | — |
| StatiXOS | — | — | — |
| ToaruOS | K Lange | — | University of Illinois/NCSA Open Source License |
| Tomato | — | — | GNU General Public License |
| TrueNAS | IXsystems | — | proprietary license, GNU General Public License, version 3.0, BSD licenses |
| WebOS Open Source Edition | — | — | Apache Software License 2.0 |