I enjoy writing software and participate in the open source community in various ways. The following is a list of projects I'm more or less actively working on and contributing to.

An eager, multi-master replication solutions for Postgres, based on the work of Bettina Kemme. Please see the dedicated project site for more information.
An event based test harness for distributed systems, originally developed for automated testing of Postgres-R.
Sure you've heard of those new, distributed version control systems, like mercurial, bazaar and git. Among them, a less well known, but amazingly well structured one is monotone. I'm using it for most of my software projects and enjoy hacking in C++ to enhance this nice tool.
Yet another dynamic memory allocator, based on the research of Maged M. Michael. Again, originally developed for use with Postgres-R, but now released and maintained separately.