OpenERP was recently named as Best Open Source Applications in the Bossie Awards 2013.
Quote from InfoWorld
OpenERP is a Python-based Web application that’s completely open source, with commercial versions providing bug fixes, migrations to new versions, and a hosting option. OpenERP 7 is a major upgrade that overhauled the user interface, which no longer requires the native client, only a Web browser.
OpenERP is loaded with features and modules (more than 3,000 at last count); lots of third-party add-ons are available, and the system is relatively easy to customize. The project originated in Europe, but there has been considerable progress in North America in the past year. The community is large and active, with many value-added partners in most areas of the world.
– Fred Blauer