Open source tools for Oracle schema compares I'm looking for an open source tool to generate DDL scripts.  Many tools call these synchronization scripts.  We essentially want to compare schema of different environments (ie: DEV to QA, QA to PROD) to manage object migrations/deployments a little easier.  Do open source tools exist like this for Oracle?
You might want to have a look at Liquibase - according to the Liquibase documentation, it can perform diffs (I'm not 100% sure whether this requires using Liquibase to version your schemas, though).