Nomics is a Python package, which I maintain, that includes utilities useful for economic analyses. It includes code for absorbed fixed effect regressions, zero inflated Poisson regressions, methods for testing treatment/control balance, propensity score matching, and more. Basil Halperin contributed significantly to the initial version.
Pythena is a Python package for connecting to AWS Athena, a query service for AWS S3. My contributions include asynchronous querying, error handling, and methods for managing existing queries
Networkx is a Python package for constructing and analyzing graphs. My small contribution has been to build a variation to the PageRank algorithm for directed graphs that allows for weighting by node exits