Operating Systems
- Apple Open Source Browser
- Apple Open Source Development Resources
- GNU-Darwin
- DragonFlyBSD
- FreeBSD
- Haiku
- Haiku - Source
- L4/Darwin ( Darbat )
- L4Linux
- L4Ka::Pistachio microkernel
- Linux Kernel Archives
- Linux Kernel Newbies
- Linux Kernel Interactive Map
- OpenSolaris.org
- QNX - Foundry27
- ReactOS
- A2 - Bluebottle
- Anion OS Forums
- apolloos
- BCOS
- CerberusOS
- Clicker 32
- Cosmos
- DexOS
- DexOS API Reference
- DynatOS
- Fiwix
- FPOS
- jimix
- KolibriOS
- KolibriOS Board
- KolibriOS wiki
- Litos
- LSD OS
- MenuetOS
- Miraculix
- MonaOS
- MOS
- Mother Operating System
- octa os
- ominOS
- ostin
- seaos kernel
- SharpOS
- SOLO
- Tabos
- tatOS
- The Mattise Operating System
- Týndur
- Unununium
- Valix
- Visopsys
- Whitix
BIG
MEDIUM
16BIT
32BIT
64BIT