The Koha Integrated Library System (ILS) has just released version 3.0 of their software. This New Zealand-based open source project is quite mature and provides many libraries cost-effective means to run their operations.
The release notes for this version show that the biggest changes are in the database storage (Zebra) and improvements in standard APIs (such as COinS and OpenSearch). Additionally, their attention to accessibility, staff templates, and additional modules is commendable.
thanks to Catalogablog for the heads-up