RSSor is social RSS/Atom/Xml online manager and reader. It allows you easily collect RSS, read and share others with the content syndicated by RSS you subscribed to.
SearchFox has released an RSS reader that aggregates and personalizes web feeds. SearchFox RSS is a private early beta release, open only to current SearchFox Beta users, friends, and family.
S. Shi, and C. Qian. Proceedings of the Annual Conference of the ACM Special Interest Group on Data Communication on the Applications, Technologies, Architectures, and Protocols for Computer Communication, page 62–75. New York, NY, USA, Association for Computing Machinery, (2020)