OCS-API


https://www.freedesktop.org/wiki/Specifications/open-collaboration-services/
https://en.wikipedia.org/wiki/Open_Collaboration_Services

OCS-API usage


KDE Attica Library: https://techbase.kde.org/Development/Tutorials/Collaboration/Attica/Introduction
KDE KNewStuff Frontend: https://techbase.kde.org/Development/Tutorials/Collaboration/HotNewStuff
NX Software Center: https://github.com/Nitrux/nx-software-center