Firebird -is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platforms.
GigaBASE is object-relational embedded database engine for C++ applications. It provides SQL-like query language, smart C++ interface (loading objects instead of tupples), transaction based on shadowing page algorithm (no separate log file and very fast)
PostgreSQL -is an advanced PostgreSQL-based search engine that provides online indexing of data and relevance ranking for database searching. Close integration with database allows use of metadata to restrict search results. Operating system: Windows, Linux/Unix, OS X, Solaris.
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