sentence: niche distributions other distributions target specific niches , such as : routers ( targeted , for example , by the tiny embedded router distribution openwrt ) bioinformatics home theater pc - s ( targeted , for example , by knoppmyth , xbmc live and mythbuntu ) specific platforms ( for example , yellow dog linux targets the apple macintosh platform ) the ubuntu project to create edubuntu for educational users karoshi is a server system based on pclinuxos and aimed at educational users .