streamparse lets you run Python code against real-time streams of data. Integrates with Apache Storm.
Probably: Simple Probabilistic Data Structures
Utilities for accessing the Parse.ly Data Pipeline
Redis Cluster with Some Features
Full-Featured Pure-Python Kafka Client
Battle-tested Apache Storm Multi-Lang implementation for Python.
Stream twitter searches using the public API.
A client library for The Guardian Open Platform. This version is forked from Simon Willison's version by Andrew Montalenti, to update it for the latest API versions and improve it generally.