* = on halt
| Name | Architectures | Active? | Kernel architecture | Target | Userpace? | GUI? | Contributors | Filesystem | License |
|---|---|---|---|---|---|---|---|---|---|
| ToaruOS | x86_64, aarch64 | no | Hybrid | Education | yes | yes | 18 | tmpfs, ext2 | NCSA |
| SiriusOS | x86_64, aarch64, aarch32, LoongArch64, RiscV 64, PowerPC, SPARC | no | Hybrid | Desktop + Embedded | yes | yes | 1 | tmpfs, ext2, Minix 3 FS | NCSA |
| Fusion | x86_64 | yes | Monolithic | N/A | yes | no | 1 | N/A | MIT |
| SerenityOS | i686 (discounted), x86_64 | yes | Monolithic | Desktop + Education | yes | yes | 1057 | ext2 | BSD-2 Clause |
| ReactOS | i386, x86_64 | yes | Hybrid | Desktop | yes | yes | 271 | FAT32, BTRFS, NTFS (Read only) | GPL 2.0, LGPL 2.1, BSD-2 Clause |
| SkiftOS | x86_64, aarch64, RiscV | yes | Microkernel | Desktop | yes | yes | 45 | ? | MIT |
| HaikuOS | i386, x86_64, RiscV | yes | Hybrid | Desktop | yes | yes | 274 | OpenBeFS | MIT and Be Sample Code License |
| Vinix | x86_64 | yes | Modular | Desktop | yes | yes | 36 | ext2, vfs, tmpfs. devtmpfs | GPLv2 |
| Gloire (ironclad) | x86_64 | yes | Monolithic | Desktop + Embedded | yes | yes | 3 | ext2 | GPLv3 |
| LemonOS | x86_64 | yes | Modular | Desktop | yes | yes | 6 | tarfs, fat32 | BSD-2 Clause |
| soso | i686 | no | Monolithic | Education | yes | yes | 2 | fat32, devfs | BSD-2 Clause |
| MOROS | x86_64 | yes | Monolithic | Desktop | yes | no | 6 (4 excluding bots) | ext2 | MIT |
| SayoriOS | i386 | yes | Monolithic | Desktop + Education | yes | yes | 7 | FAT12, FAT32, tmpfs, natfs, nvfs, nullfs | GPLv3 |
| Lyre | x86_64 | no | ? | Desktop | yes | yes | ? | ? | BSD-2 Clause (probably) |
| Aero | x86_64, aarch64 | yes | Monolithic | Desktop | yes | yes | 12 (11 excluding bots) | ext2 | GPLv3 |
| NanoshellOS | i686 | yes | Monolithic | Desktop | yes | yes | 5 | ext2 | GPLv3 |
| LucarioOS | i686 | yes | Monolithic | Desktop | no | under construction | 1 | N/A | MIT |
| EggOS | i386/i686, x86_64 | no | Unikernel | Education | yes | no | 6 | vfs, devfs | MIT |