psycopg is a PostgreSQL database adapter for the Python programming language. Its main advantages are that it supports the full Python DBAPI 2.0 and it is thread safe at level 2. It was designed for heavily multi-threaded applications that create and destroy lots of cursors and make a conspicuous number of concurrent INSERTs or UPDATEs. The psycopg distribution includes ZPsycopgDA, a Zope Database Adapter.
Optnik is a CLR library to help with option parsing and command execution. It is very similar to Mono.Options but has support for sub-commands, each with its own private set of options. Optnik is written in C# and runs on Mono and MS .NET (and probably on other CLR implementations too).
Greengrass is a C# framework providing a high-level API for the Resource Description Framework (RDF), allowing RDF triples to be parsed, stored, and manipulated. Greengrass supports serialization and deserialization of CLR types to plain RDF, OWL, and other RDF vocabularies. Greengrass should work with any CLR-complied language, like C#, BOO, IronPython, Nemerle, IKVM Java, and VB.NET.