I started a website called OpenSourcely to do exactly this.
It aggregates news, projects, and announcements related to open source.
I’m always on the lookout for new RSS feeds and outlets to add to it, so if anyone has any, feel free to send them my way.
Yeah, it’s only an aggregator that then points you to the original content. For legal reasons, I don’t think OpenSourcely would be able to host the original content natively.