1. Factbookfactbook gem - scripts for the world factbook (get open structured data e.g JSON etc.)
2. Factbook.jsonWorld Factbook Country Profiles in JSON - Free Open Public Domain Data - No API Key Required ;-)
3. factbook.sqlWorld Factbook Country Profiles in SQL (Incl. factbook.db - Single-File SQLite Distro) - Free Open Public Domain Data