Sesame is an Open Source RDF Schema-based repository and querying facility. It is a scalable, modular architecture for persistent storage and querying of RDF and RDF Schema. It supports two query languages (SPARQL and SeRQL), and can use main memory or PostgreSQL, MySQL and Oracle 9i databases for storage.
SQL Uniform is a database comparison and SQL query program. It is a database client with a graphical user interface. It supports any kind of database and database servers to which there is an ODBC or JDBC standard driver. It has been tested on Access, Adabas D, DaffodilDB, dBASE, Excel, HSQL, IBM DB2, Interbase (Firebird), JDataStore, Linter (Relex), McKOI, Mimer, MSSQL, MySQL, Openlink Virtuoso, Oracle, Paradox, Pervasive (Btrive), Pointbase, PostgreSQL, Solid, SQLITE, Sybase, ThinkSQL, and Yard.
fswalker is an indexer and query tool for large filesystems. On large filesystems it is impossible to run tools such as du and obtain results in a reasonable time. fswalker crawls over a filesystem and populates a SQLite database containing information about each file. The fsq utility can then be used to query the database and obtain information much faster. It is intended that fswalk be run in a periodic manner so the sysadmin can monitor changes in the filesystem and produce reports.