CDB is a abstract and simple wrapper to different client libraries of sql databases. It is written in C and C++. Supported are PostgreSQL, MySQL, SQLite and Oracle rdbms. It should run in many modern Linux and BSD environments.
A cross platform chess database which supports ChessGML, PGN, SVG, PostgreSQL and plugins written in Java or Jython. Some Python chess libraries and some Python tools are included.
Usable pieces are Java and Python opening classification libraries.