Fox, NBCUniversal and Viacom joined together to offer a marketplace for buying linear and long-form digital video. The platform, dubbed OpenAP 2.0, will be available in time for fall programming and allow media buyers to construct segments for long-form digital video and linear in the same place. The marketplace, built in collaboration with Accenture and FreeWheel, will be accessible at OpenAP.tv and offer clients cross-publisher analytics, including pre-campaign performance projects and post-campaign results. The competitors have worked together before on an ad marketplace. OpenAP, which launched in 2017 and was intended to make it easier for advertisers to reach audiences across TV publishers. “With competition rising in every industry, marketers need new ways to define their audience and engage viewers across all platforms,” said Linda Yaccarino, chairman, advertising and client…