- Arca Noae – operating system, based on OS/2 Warp 4.52
- EComstation – the old rehash of OS/2
- EComstation.ru
- OS/2 World – community resource for OS/2
- Netlabs
- Netlabs Wiki
- FreeRTOS – Real-time operating system for microcontrollers
- HAIKU an open source operating system
- FreeDOS
- Software optimization resources
- EDM/2 Wiki – source for OS/2 and eComStation developers
- Open Watcom – Open Source Watcom C/C++ and Fortran cross compilers and tools
- Open Watcom v2 – current Open Watcom source
- kLIBC svn page
- The un*x to OS/2-EMX Porting FAQ
- The POSIX/2 Project
- Alexander Mai’s OS/2 page
- Paul Smedley’s gcc port page
- AndyMac’s Home (Python port)
- Tavi OS/2 pages
- osFree project – a free OS project
- osDev – OS development site – very good
- Operating Systems Paul at Rutgers Spring 2015
Blogs
- pagetable.com Some Assembly Required
- Fun with virtualization
- Bleepingcomputer