Below are links to various countries with Ostrowiec societies/websites.
Poland
Wojtek Mazan blog
(Ostrowiec Jewish History -in Polish)
Pomnik Zydow Ostrowieckich - Facebook Page
Facebook page for Ostrowiec related topics -( in Polish)
MPZO- Młodzi Przyjaciele Żydów z Ostrowca
Young Friends of Jews of Ostrowiec Memorial Project -Local (Ostrowiec) Facebook Group (in Polish)
Monika Pastuszko blog
(in Polish)