| ASUS Express Gate | ASUS | — | — |
| Athena OS | — | — | MIT License |
| Auditor | — | — | — |
| Augustux | — | — | GNU General Public License |
| Aurora | — | — | GNU General Public License |
| AUSTRUMI Linux | Andrejs Meinerts | — | GNU General Public License |
| AVLinux | — | — | — |
| AxOS | — | — | GNU General Public License, version 3.0 |
| Axyl OS | — | — | — |
| Azure Linux | Microsoft | — | MIT License, GNU General Public License |
| Azure Sphere OS | Microsoft | — | MIT License |
| BackBox | — | — | GNU General Public License |
| BackSlash Linux | Kumar Priyansh | — | Apache Software License 2.0 |
| BackTrack | — | 2006 | GNU General Public License |
| Baltix | — | — | GNU General Public License |
| Bankix | — | — | — |
| BasicLinux | — | — | — |
| Batocera.linux | — | — | GNU General Public License |
| Bazzite | — | — | Apache Software License 2.0 |
| BeatrIX | — | — | — |
| Bedrock Linux | — | — | GNU General Public License, version 2.0 |
| Behördendesktop | Federal Office for Information Security | — | — |
| BengalOS | — | — | — |
| Berry Linux | — | — | — |
| Bharat Operating System Solutions | Centre for Development of Advanced Computing | — | GNU General Public License |
| Bifrost | — | — | — |
| Big Linux | Bruno Gonçalves | — | — |
| BinToo GNU / Linux | — | — | — |
| BlackArch Linux | — | — | 3-clause BSD License |
| BlackPanther OS | — | — | — |
| BLAG Linux and GNU | — | — | GNU General Public License |
| BlankOn | — | — | — |
| BlendOS | — | — | — |
| Bluefin | — | — | — |
| Bluewhite64 | — | — | — |
| Bodhi Linux | — | — | GNU General Public License |
| Bonzai Linux | — | — | — |
| Boot-root | H J Lu | — | — |
| Bridge Linux | — | — | GNU General Public License |
| Buildix | ThoughtWorks | — | — |
| BunsenLabs | — | 2015 | — |
| CachyOS | — | — | GNU General Public License |
| CAElinux | — | — | — |
| CAINE Linux | — | — | — |
| Caixa Mágica | — | — | — |
| Calculate Linux | — | — | GNU General Public License |
| Caldera OpenLinux | Caldera | — | — |
| Canaima | CANTV, CNTI | — | GNU General Public License |