OS/2 Warp & OS/4:

    CORE/2: new loader and kernel
    OS/2World.com: forum and newsline
    OS/2News: news and WarpStock conferences
    OS/2Ports: Unix software under OS/2
    NetLabs: OS/2 software
    DMOZ: OS/2 (links)
    OS/2.org: forum
    EDM/2

Real-time software:

    FreeRTOS
    FreeDOS

Programming:

    RSDN.ru
    OpenNet.ru
    DMOZ: Programming

Economics:

    Austrian school

Music:

    Ska, Rocksteady and Reggae
    Russian 7-string guitar

Martial arts:

    Chinese Wushu