Stream Framework is a Python library, which allows you to build news feed, activity streams and notification systems using Cassandra and/or Redis. The authors of Stream-Framework also provide a cloud service for feed technology:

Django Client - Build Activity Feeds & Streams with GetStream.io

JS / Browser Client - Build Activity Feeds & Streams with GetStream.io

Laravel Client - Build Activity Feeds & Streams with GetStream.io

Python Client - Build Activity Feeds & Streams with GetStream.io

PHP Client - Build Activity Feeds & Streams with GetStream.io

Chronologic: activity feeds as a service.

NodeJS Client - Build Activity Feeds & Streams with GetStream.io

Web UI for decentralized social networks and marketplaces. Features: blogs, posts, comments, likes, reputation, feed and notifications. Built with Next.js, React and Ant Design.

GetStream.io Go client

Ruby Client - Build Activity Feeds & Streams with GetStream.io

Activity Feed, Timeline, News Feed, Notification Feed with MongoDB, Node and CRDTs

NOTE: Development continues in https://github.com/dappforce/subsocial-parachain repo. Subsocial full node with Substrate/Polkadot pallets for decentralized communities: blogs, posts, comments, likes, reputation.

Stream Feed official Flutter SDK. Build your own feed experience using Dart and Flutter.

Java Client - Build Activity Feeds & Streams with GetStream.io

Meteor Client - Build Activity Feeds & Streams with GetStream.io

NET Client - Build Activity Feeds & Streams with GetStream.io

GO / GOlang Client - Build Activity Feeds & Streams with GetStream.io

Off-chain storage for Subsocial blockchain. This app builds user feeds and notifications by subscribing to Substrate events.

Activity tracking for Ecto