There are no packages for Audacious and Axel. Audacious is a GTK+2 based music player and Axel is a fastest download manager and very popular among our friends in India.
Smplayer looks ugly , i Need smplayer-skins and smplayer-themes too.
Do i clone them from github ?
See the docs:
https://kaosx.us/docs/
https://kaosx.us/docs/package/
Audacious is in KCP (if you read what KaOS is, you know the repos are limited and only GTK apps are added that have no Qt option, not the case with the over a dozen available music player options in the repos https://kaosx.us/about/ https://kaosx.us/about/toolkits/).:
https://kaosx.us/docs/kcp/
https://kaosx.us/docs/kcp/#using-kcp-helper-package-or-octopi
