Divmod Axiom is an object database, or alternatively, an object-relational mapper, implemented on top of Python.
Note: Axiom currently supports only SQLite and does NOT have any features for dealing with concurrency. We do plan to add some later, and perhaps also support other databases in the future.
Its primary goal is to provide an object-oriented layer with what we consider to be the key aspects of OO, i.e. polymorphism and message dispatch, without hindering the power of an RDBMS.
Axiom is a live database, not only an SQL generation tool: it includes an implementation of a scheduler service, external file references, automatic upgraders, robust failure handling, and Twisted integration.
Axiom is tightly integrated with Twisted, and can store, start, and stop Twisted services directly from the database using the included 'axiomatic' command-line tool.