• Bucardo
  multi-master replication for Postgres
  with database license-bsd open-source postgres
• MySQL AB
  Managing Hierarchical Data in MySQL
  with articles database sql by 2 users
• Storing Hierarchical Data in a Database [PHP & MySQL Tutorials]
  
  Whether you want to build your own forum, publish the messages from a mailing list on your Website, or write your own CMS: there will be a moment that you’ll want to store hierarchical data in a database. Gijs explains two practical methods to do just that.
  with articles database sql by 2 users
• Troels' links
  Relational database systems
  with database links reference

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