repoze.catalog is a Python indexing and searching framework. It relies on zope.index and most of its internals are taken from zope.app.catalog. Unlike zope.app.catalog, however, it is meant to be useful outside of the larger Zope framework within arbitrary Python applications.
Narrative documentation explaining how to use repoze.catalog.
API documentation for repoze.catalog.
Source code is available from https://github.com/repoze/repoze.catalog
File bugs via https://github.com/repoze/repoze.catalog/issues